Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb1d6f2642f5fa0…

MALICIOUS

PDF

56.1 KB Created: 2020-07-15 05:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98aed27a735bb20537530075f2d958d9 SHA-1: 9234809dfd29653dba552178d4d11725e715582d SHA-256: 6bb1d6f2642f5fa0863185048421223827f4a260c61d7769e59e6b17ac4dbd1a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous external PDF links suggests a link farm or SEO poisoning attempt, likely to obscure the malicious redirector. No scripts were extracted, but the primary attack vector appears to be directing users to malicious infrastructure via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=bocconia%20frutescens%20pdf
    • http://files.colecountygenealogy.com/uploads/1/3/0/7/130739059/7037789.pdf
    • http://files.nightofmanywords.com/uploads/1/3/1/6/131637313/b1f102.pdf
    • http://files.runningwithspiritbabies.com/uploads/1/3/1/4/131438397/3166615.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gabagijujusudizal.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jobevemavesofidubuxiwi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nujogopuju.pdf
    • https://wevekemuvu.files.wordpress.com/2020/07/39794554157.pdf
    • https://bajanifo.files.wordpress.com/2020/07/dipolixozagumoriwoxod.pdf
    • https://gofenibom187364652.files.wordpress.com/2020/07/18953359813.pdf
    • https://cdn.shopify.com/s/files/1/0430/2041/9226/files/63963393549.pdf
    • https://cdn.shopify.com/s/files/1/0431/8609/4248/files/bonanijaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/vodevudunowukuvapaxojo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/24803542318.pdf
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/26050253397.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zurutadodusabexefiba.pdf
    • https://cdn.shopify.com/s/files/1/0432/5300/6494/files/1886082410.pdf
    • https://cdn.shopify.com/s/files/1/0430/2117/2897/files/xuwifilajuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xajubebajodefemun.pdf
    • https://cdn.shopify.com/s/files/1/0433/3525/4171/files/larepodarevu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009fa7.bin
42b4f3d2be56a2e234626b60f6a2094335c16769cd5d27a59d0c66f2848b27c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FA7 5048 bytes
font_01_sfnt_off0000b0d7.bin
8435578ee7ef8326445d6a8997b9e53040868fda74d64b14880852067a04919e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D7 10148 bytes

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