Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d9031a312474d1…

MALICIOUS

PDF

66.0 KB Created: 2020-08-06 20:41:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 025920f9fb0b10d0f2af7b32a27c491c SHA-1: ee2057e6f1760da37b34a4aef71d907d194ca0cf SHA-256: 31d9031a312474d1f05a93e71959b7d7a91a21881bf5098d2ef6431b65cdf38e
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document was flagged as malicious by an ML classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=asmaul+husna+pdf+khassida', which is likely the primary lure. The presence of numerous other PDF links suggests a link farm or SEO poisoning tactic to distribute the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=asmaul+husna+pdf+khassida
    • http://files.smithson-gunmaker.com/uploads/1/3/1/0/131069886/3953934.pdf
    • http://files.minnesotaswimcamps.com/uploads/1/3/1/4/131483197/1192376.pdf
    • http://pomise.homesewnbycarolyn.com/uploads/1/3/1/3/131384635/6908988.pdf
    • http://kotobemu.wildharvestfestival.org/uploads/1/3/1/0/131070487/1166212.pdf
    • http://files.talentrisecorp.com/uploads/1/3/0/7/130739227/f25304800d28.pdf
    • https://cdn.shopify.com/s/files/1/0435/7862/2111/files/aprender_alemo_basico.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/files/71389983527.pdf
    • https://cdn.shopify.com/s/files/1/0432/1512/6692/files/tatokiguvonadopem.pdf
    • https://cdn.shopify.com/s/files/1/0433/9145/1294/files/75994812744.pdf
    • https://cdn.shopify.com/s/files/1/0437/5589/6990/files/7704612477.pdf
    • https://cdn.shopify.com/s/files/1/0431/7242/9980/files/setabegiwiwubaxaxopaliv.pdf
    • https://cdn.shopify.com/s/files/1/0432/2964/2911/files/51247281261.pdf
    • https://cdn.shopify.com/s/files/1/0432/7640/2854/files/zuxiramomefugi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2361/3595/files/25203774170.pdf
    • https://cdn.shopify.com/s/files/1/0430/8090/8949/files/88335090138.pdf
    • https://cdn.shopify.com/s/files/1/0435/2229/3920/files/38690077791.pdf
    • https://cdn.shopify.com/s/files/1/0433/6982/4407/files/thomas_multivariable_calculus.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000b972.bin
177a667a4eba5988a86700ac4e1dde4d8f5bf710cba9fc27b57ebe7ad9cefdfc		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB972 28960 bytes
font_00_sfnt_off0000778b.bin
de075b1ee58de2e88502d42f6c5496b1cd4dc63b81bd57a8ac2032b8cc92ac6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x778B 4812 bytes
font_01_sfnt_off000087a4.bin
d44d9d5436088a83383dffddaa64831d0200bf931b94266b4989f1edbd48a546		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87A4 16448 bytes
font_03_sfnt_off0000ec73.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC73 4324 bytes

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