Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f96689e7ed58be0…

MALICIOUS

PDF

37.6 KB Created: 2020-08-28 01:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11362531afff492db56b766d1133d65a SHA-1: df2458b394587dbb90cccac31e664346494b8a3f SHA-256: 7f96689e7ed58be0442350279932e624df2c752652ca1ba368a346af64707003
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://ttraff.cc/pify?keyword=logic+puzzles+for+middle+school+math`. It also exhibits a PDF link farm heuristic, containing 26 external PDF links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users through a link farm, likely to distribute further malicious content or engage in SEO poisoning.

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.cc/pify?keyword=logic+puzzles+for+middle+school+math
    • http://files.vioptometry.com/uploads/1/3/0/7/130776183/433ebf4f5d1f.pdf
    • http://files.carolitaro.com/uploads/1/3/2/7/132740414/rugagomunasusa_rulizezidusifok_fipib.pdf
    • http://files.nealyibclc.com/uploads/1/3/1/3/131380847/d8cd71ab2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/4907/4336/files/32425080013.pdf
    • https://cdn.shopify.com/s/files/1/0463/1239/0821/files/uncontested_divorce_forms_ny.pdf
    • https://cdn.shopify.com/s/files/1/0433/7028/3173/files/38963897963.pdf
    • https://cdn.shopify.com/s/files/1/0440/5025/1941/files/jedezufita.pdf
    • https://cdn.shopify.com/s/files/1/0440/1758/2230/files/terebojewuz.pdf
    • https://cdn.shopify.com/s/files/1/0434/4017/7314/files/ganesigozejozawimivapag.pdf
    • https://cdn.shopify.com/s/files/1/0440/5847/6694/files/exercice_corrig_d_atomistique.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/files/vanguard_retirement_planning.pdf
    • https://cdn.shopify.com/s/files/1/0430/6301/7629/files/43069332198.pdf
    • https://cdn.shopify.com/s/files/1/0431/0522/2818/files/muguwu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000468f.bin
98d5bb5b10ed4191f9bf2aa171e05f66907610db2db83da5889e07ece68b2d2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x468F 5336 bytes
font_01_sfnt_off000058c7.bin
c66b6f239f78d55189b075d8aa42b0c4c8d137e7bb8de92a312cd81758322115		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58C7 10296 bytes
font_02_sfnt_off00007bb3.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB3 4324 bytes

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