Malicious PDF — malware analysis report

Static analysis result for SHA-256 07b91a14b11d8bdf…

MALICIOUS

PDF

39.5 KB Created: 2020-07-31 22:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0325fd3d7da76bfb4230ae8185dd273a SHA-1: 9b7bf90af97d315a01048ecb573aa1574b9a6eb0 SHA-256: 07b91a14b11d8bdf18b8245483039ff52056fe56fc4126273872bd3a0dc6541a
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, including a critical redirector link to 'ttraff.com'. The document body, though obfuscated, contains text suggesting it is an 'Alexa cheat sheet' and includes the malicious URL, indicating a lure for phishing or malware delivery. The presence of many external PDF links suggests a link farm or SEO poisoning tactic to distribute malicious content.

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/pify?keyword=alexa+cheat+sheet
    • http://files.starstatusboxingpa.com/uploads/1/3/1/6/131606465/997d8.pdf
    • http://files.gospel.link/uploads/1/3/1/3/131379213/1998327.pdf
    • http://files.flourish-homestead.com/uploads/1/3/1/4/131407890/vokuvu.pdf
    • http://files.absolutetime.net/uploads/1/3/0/7/130775084/1450990.pdf
    • http://files.columbiapacificlaw.com/uploads/1/3/2/7/132712373/fd770.pdf
    • http://www.http://www.http://www.http://www.http://www.http://www.http://www.http://www.http://w
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sesolofulazige.pdf
    • https://cdn.shopify.com/s/files/1/0428/3544/3875/files/vegix.pdf
    • https://cdn.shopify.com/s/files/1/0435/8212/8283/files/17809561948.pdf
    • https://cdn.shopify.com/s/files/1/0438/5990/2624/files/97663415706.pdf
    • https://cdn.shopify.com/s/files/1/0435/9107/3947/files/94984681673.pdf
    • https://cdn.shopify.com/s/files/1/0430/1173/5705/files/jezevogesinifodanariga.pdf
    • https://cdn.shopify.com/s/files/1/0430/4545/3985/files/zakisekedezabexizetu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9373/7110/files/67077501802.pdf
    • https://cdn.shopify.com/s/files/1/0438/6209/8085/files/tupowutumufazem.pdf
    • https://cdn.shopify.com/s/files/1/0433/1284/0862/files/petevekurusosesunanoke.pdf
    • https://cdn.shopify.com/s/files/1/0438/1235/6253/files/98202588794.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_off00005eb4.bin
81b160ae82b20a97e5c0d7c98d4e5f91c7c67f21fb16aaf56abd39ee90d5ac83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB4 4848 bytes
font_01_sfnt_off00006f2f.bin
9799d3eb8ef098603e97a99d782b240f3afa7c4baada6db92a1fc459b0304394		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F2F 9980 bytes

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