Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c77a065316d216…

MALICIOUS

PDF

78.3 KB Created: 2020-08-08 07:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9dfcf8d032165c766f41987b24ec4f6 SHA-1: 184a5f415f00d028316cb8d4aa5209c9df655cd3 SHA-256: a6c77a065316d2161b4c9b089ec25a8eb4b8eb8811c1a1eafa0f7510e44729f2
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, which is indicative of a link farm. One critical heuristic firing identified a link to known malicious redirector infrastructure at `ttraff.ru`. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL `https://ttraff.ru/pify?keyword=anualidades+vencidas+ejercicios+pdf`, suggesting the document's purpose is to redirect users to 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.ru/pify?keyword=anualidades+vencidas+ejercicios+pdf
    • http://files.haltapes.com/uploads/1/3/2/6/132681928/5626980.pdf
    • http://files.cifsf.org/uploads/1/3/0/7/130739238/butoniki.pdf
    • http://files.schwetjeproject.com/uploads/1/3/1/4/131483153/nexadomaxutokuzonup.pdf
    • https://cdn.shopify.com/s/files/1/0432/0873/6928/files/dezetugagiz.pdf
    • https://cdn.shopify.com/s/files/1/0444/4500/8039/files/general_biology_1_grade_12_module.pdf
    • https://cdn.shopify.com/s/files/1/0430/8575/8628/files/31751494430.pdf
    • https://cdn.shopify.com/s/files/1/0435/9811/9071/files/nomifujapumerazu.pdf
    • https://cdn.shopify.com/s/files/1/0433/1575/7214/files/zarapoluf.pdf
    • https://cdn.shopify.com/s/files/1/0434/8664/2336/files/62657776324.pdf
    • https://cdn.shopify.com/s/files/1/0437/6258/1658/files/accidente_cerebrovascular_hemorragico_tratamiento.pdf
    • https://cdn.shopify.com/s/files/1/0447/1750/6716/files/game_design_merit_badge_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/0716/5095/files/34358524324.pdf
    • https://cdn.shopify.com/s/files/1/0435/9038/5821/files/84937033534.pdf
    • https://cdn.shopify.com/s/files/1/0438/8922/9979/files/41460439351.pdf
    • https://cdn.shopify.com/s/files/1/0437/2961/7057/files/wozejax.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13977314479.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db25.bin
95299849efaf2cbd76433b3d0a4be2fe814cb5ee21d349d9555441f601b4ccfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB25 5076 bytes
font_01_sfnt_off0000ec6d.bin
3ad40339bf0b06b0fab1f7e6f8fe5d4f57e8a1f1e6bcd149a2e3a53e82e4950b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6D 15968 bytes
font_02_sfnt_off00011c6d.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6D 4324 bytes

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