Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab889a8af5dc6553…

MALICIOUS

PDF

36.9 KB Created: 2020-07-10 19:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 2432ff330bb2be89bda9320f4da347d7 SHA-1: ce6e392fc4906e626054cbda5a89f7fcd5c71b4c SHA-256: ab889a8af5dc65533ee4732a781ef22ac54896d8d6acf78ede5c55ab3c4988a5
192 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which point to a redirector service known to host malicious content. The document body also contains a direct link to a malicious redirector. The presence of a "download button" heuristic further suggests a lure to download malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=c%25E1%25BA%25AFt+gh%25C3%25A9p+file+pdf+b%25E1%25BA%25B1ng+foxit+reader In PDF document text
    • http://files.inspiralpathways.com/uploads/1/3/0/8/130874541/gubaje.pdfIn PDF document text
    • http://files.percivaleast.com/uploads/1/3/2/8/132815968/bigawusex.pdfIn PDF document text
    • http://files.thefitanista.com/uploads/1/3/0/7/130774990/e591f72a.pdfIn PDF document text
    • http://files.mnmsprinkler.com/uploads/1/3/1/3/131380564/8885353.pdfIn PDF document text
    • http://files.lauriebenningroberts.com/uploads/1/3/1/4/131438002/a2d488.pdfIn PDF document text
    • http://files.newyorkstategrandcouncil.com/uploads/1/3/1/4/131437538/bapemo.pdfIn PDF document text
    • http://files.ekoforteang.net/uploads/1/3/1/3/131397934/liloxazuref.pdfIn PDF document text
    • http://files.mailserver.academiadeballetallegro.com/uploads/1/3/1/4/131452804/noxareterulixugizodu.pdfIn PDF document text
    • http://files.cos-medics.com/uploads/1/3/0/7/130774970/mulozatawetovi-nisunuled-golawekifo-nuvefinul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://jagenanevor.files.wordpress.com/2020/06/vexovonad.pdfIn PDF document text
    • https://redelas.files.wordpress.com/2020/06/takemu.pdfIn PDF document text
    • https://sobafazufog.files.wordpress.com/2020/06/96630157757.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9454/0452/files/4578203154.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/66083684812.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/felamisakawubibaxejurelok.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_off00005195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5195 5860 bytes
SHA-256: 10db5498a92f684c935172f3a65cdd9f7afba25521d70d418c53fa7893ebfd90
font_01_sfnt_off000063d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63D1 9596 bytes
SHA-256: 842d064330e65b2230b25b24a27f2aef32e3a99685c03c788d9e689acb9ea8a4

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