Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ce0d1a8ddd41d8…

MALICIOUS

PDF

37.4 KB Created: 2020-07-09 00:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: 6cd9706a0ecf7289c1a450ab6edc60ac SHA-1: f2847f3ce50579bb17b74357096e670cb629cc54 SHA-256: 31ce0d1a8ddd41d82a81d9501d320e7e5718af24b5844d11837eae25482fb00b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded URLs, many of which point to domains that appear to be part of an SEO link farm. One critical heuristic firing indicates a malicious redirector link to 'ttraff.com'. The document body, though heavily obfuscated, contains keywords related to 'letter o worksheets for preschool' and the same URLs, suggesting a lure to drive traffic to potentially malicious or ad-heavy sites. No scripts were extracted, but the extensive link farm and redirector indicate a campaign focused on traffic generation and potentially phishing or malware distribution.

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=letter%20o%20worksheets%20for%20preschool In PDF document text
    • http://files.dunphyshandguntraining.com/uploads/1/3/2/6/132681566/d354c601d.pdfIn PDF document text
    • http://files.kristindraucker.com/uploads/1/3/1/4/131409385/9fd97f0.pdfIn PDF document text
    • http://files.obxelectrical.com/uploads/1/3/2/6/132681658/5815100.pdfIn PDF document text
    • http://files.scottcardmusic.com/uploads/1/3/0/8/130874307/gopevovoduforiv.pdfIn PDF document text
    • http://files.vitiligans.org/uploads/1/3/0/8/130874175/6fcf13c733f38.pdfIn PDF document text
    • http://files.jake-hill.com/uploads/1/3/0/7/130775371/rowapaxolafok.pdfIn PDF document text
    • http://files.ed-conference.org/uploads/1/3/1/6/131637385/tosodudofopadez.pdfIn PDF document text
    • http://files.creativecounselingsrq.org/uploads/1/3/2/7/132710787/5366484.pdfIn PDF document text
    • http://files.jessicawasserman.com/uploads/1/3/0/9/130969298/37d0bf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://tofunibak.files.wordpress.com/2020/06/97367565384.pdfIn PDF document text
    • https://fazupisis.files.wordpress.com/2020/06/mubikowigifurepa.pdfIn PDF document text
    • https://jifebavos.files.wordpress.com/2020/07/bewofogexuzugega.pdfIn PDF document text
    • https://funurozizeli.files.wordpress.com/2020/06/39893116203.pdfIn PDF document text
    • https://mifowoxar.files.wordpress.com/2020/06/marul.pdfIn PDF document text
    • https://voferesubexi.files.wordpress.com/2020/07/18699369072.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53940500656.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rirolor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8011835234.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E90 4624 bytes
SHA-256: 7bcbc92f8d904501b080627c74db8654f2c297ee81a5d73c23b1ce4523b24521
font_01_sfnt_off00005e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E77 13332 bytes
SHA-256: e201762f5edfbaa560898a1cc3354280ac43ea3e3e082209bdc4337bde1a9f4a

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