Malicious PDF — malware analysis report

Static analysis result for SHA-256 644504de2ea9f5bf…

MALICIOUS

PDF

50.0 KB Created: 2020-08-08 20:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cd72901ddf5b794a0186182c5e33201 SHA-1: cc68156651d229390e519600b241f45aadbf1f62 SHA-256: 644504de2ea9f5bfb55b4d62ad6393391ab03bfd47e7ff986bc11f0bb40b4a27
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.cc/pify?keyword=countries+and+capitals+of+the+world+by+continent+pdf`. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL.

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=countries+and+capitals+of+the+world+by+continent+pdf
    • http://files.firsttrinitylutheranchurch.com/uploads/1/3/0/7/130739690/paweveladarinonoxul.pdf
    • http://files.isaakthetutor.com/uploads/1/3/1/8/131856134/8308844.pdf
    • http://files.hazelcirclelenses.com/uploads/1/3/1/8/131871902/218e4a483978b4.pdf
    • http://files.paramountdesigngroup.net/uploads/1/3/0/7/130738993/5474835.pdf
    • http://files.creep-o-ree.com/uploads/1/3/1/3/131380467/welimepanirezazixito.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/5963/4591/files/xovisunopezatomas.pdf
    • https://cdn.shopify.com/s/files/1/0429/9803/8679/files/43734415309.pdf
    • https://cdn.shopify.com/s/files/1/0427/4959/1718/files/didaxixuvedamado.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/99594865370.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/soradediwusezap.pdf
    • https://cdn.shopify.com/s/files/1/0432/5048/3368/files/wezugadujunumagow.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54058680795.pdf
    • https://cdn.shopify.com/s/files/1/0435/9861/0589/files/96574409844.pdf
    • https://cdn.shopify.com/s/files/1/0429/7667/3946/files/mozaliron.pdf
    • https://cdn.shopify.com/s/files/1/0437/4301/9157/files/application_of_differentiation_and_integration_in_economics.pdf
    • https://cdn.shopify.com/s/files/1/0430/6265/7177/files/76949336290.pdf
    • https://cdn.shopify.com/s/files/1/0435/2252/3288/files/likulizogajedibumega.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_off000077a5.bin
87d097984639d0f38a5cadaceb1ac324055f5083becb9a808b45b30d05e954d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77A5 5480 bytes
font_01_sfnt_off00008a55.bin
7302a962a2213a4f426bf6a5e4ac498685231283318b1c5563be2ca7dc1df049		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A55 9972 bytes
font_02_sfnt_off0000ac88.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC88 4324 bytes

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