Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4b77decc8dc3ae…

MALICIOUS

PDF

51.7 KB Created: 2020-07-08 19:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: a4f76a785b0b4e5ea4536495334e343b SHA-1: 460c861a513c489822cdd4873050d295e21a2927 SHA-256: ba4b77decc8dc3ae6fdea1ab763e12ec448780c1afc5cd9168b467f7f84a52eb
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a high density of external links, many of which point to domains that appear to be part of a link farm designed to obscure the ultimate destination. One critical heuristic identified a direct link to a known malicious redirector, ttraff.com. The document body, though heavily obfuscated, contains this same redirector URL, suggesting the primary intent is to drive users to malicious infrastructure. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/wb?keyword=interview%20preparation%20in%20industrial%20instrumentation%20&%20process%20control%20technology%20pdf In PDF document text
    • http://files.kimberlyjherb.com/uploads/1/3/1/4/131407734/6aaa27c09255.pdfIn PDF document text
    • http://files.nickpateras.org/uploads/1/3/2/7/132710655/d914f150ae.pdfIn PDF document text
    • http://files.barrons-conferences.com/uploads/1/3/1/4/131409170/3066792.pdfIn PDF document text
    • http://files.temenosjournal.com/uploads/1/3/1/8/131871762/fosevup.pdfIn PDF document text
    • http://files.psychometricdynamics.com/uploads/1/3/1/0/131070116/9284285.pdfIn PDF document text
    • http://files.thecovenantschristandyou.com/uploads/1/3/1/3/131379434/94345039.pdfIn PDF document text
    • http://files.bampilates.com/uploads/1/3/1/4/131438741/1940dcd9a51.pdfIn PDF document text
    • http://files.eriepoloniahistory.com/uploads/1/3/0/8/130873876/7020409.pdfIn PDF document text
    • http://files.lawrencelionsbasketball.com/uploads/1/3/0/9/130969907/pafunitanoru.pdfIn PDF document text
    • http://files.agathafashion.shop/uploads/1/3/0/9/130969375/9654079.pdfIn PDF document text
    • http://files.yolandacstudio.com/uploads/1/3/1/6/131637325/misuxozidup.pdfIn PDF document text
    • http://files.reneeisverycool.com/uploads/1/3/1/8/131856041/butumagitexo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://wuxafojibom.files.wordpress.com/2020/06/rinixotuvuvi.pdfIn PDF document text
    • https://dejikirunu.files.wordpress.com/2020/07/lidumajaxo.pdfIn PDF document text
    • https://vivaguki.files.wordpress.com/2020/06/52884193382.pdfIn PDF document text
    • https://gapigibodaj.files.wordpress.com/2020/07/foxojadupunekug.pdfIn PDF document text
    • https://digogaba.files.wordpress.com/2020/06/26359398009.pdfIn PDF document text
    • https://duxinum.files.wordpress.com/2020/07/rukomitugitirufufed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/52665001447.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85450973079.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mefiwi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ropuxikasafomudixaxo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zemeletitofugawekabol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejumaxerufu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B78 5076 bytes
SHA-256: 597ce124a4860cd5e205322ebcef1d11e65fe2582ecc7ca18527cc5f777498fc
font_01_sfnt_off00009ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9CA8 10656 bytes
SHA-256: 60c3c0d4422fb84393c13f7fa3d8b023075b9fcf4cbbfdd0f2b34b46b0b843ef