Malicious PDF — malware analysis report

Static analysis result for SHA-256 1367ed59978426b8…

MALICIOUS

PDF

48.1 KB Created: 2020-08-05 07:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de4dc9db44b044a9ec72b80e152ce6a4 SHA-1: 6a5eef6ff42271e188f7c2aa79b6f9372df2597f SHA-256: 1367ed59978426b839d663d32925ad9ae0f5548ff20f489f1841a9baefd72467
194 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a link farm. The document body, though heavily obfuscated, contains a URL that appears to be part of the lure. The presence of numerous external PDF links suggests an attempt to distribute further malicious content or engage in SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=ssc+answer+sheet+format+pdf
    • http://files.wordsmithphoto.com/uploads/1/3/1/8/131871704/rusok.pdf
    • http://files.naturesintent.co/uploads/1/3/0/7/130740530/49873.pdf
    • http://files.asips.net/uploads/1/3/2/6/132681690/7133402.pdf
    • http://files.californiaconservationoftrails.org/uploads/1/3/1/4/131438419/29d578d6d79370.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/5100/7638/files/lewalusanamebikuf.pdf
    • https://cdn.shopify.com/s/files/1/0437/4380/5591/files/zuzixubazotonafinokowup.pdf
    • https://cdn.shopify.com/s/files/1/0432/6237/8152/files/nojigerezosopavilexerupon.pdf
    • https://cdn.shopify.com/s/files/1/0430/7792/7072/files/2954132542.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/kabivimuwo.pdf
    • https://cdn.shopify.com/s/files/1/0434/2244/9820/files/60188578009.pdf
    • https://cdn.shopify.com/s/files/1/0429/4931/2666/files/kezomozixaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/9702/1861/files/matiniren.pdf
    • https://cdn.shopify.com/s/files/1/0437/6068/1111/files/array_to_string_javascript.pdf
    • https://cdn.shopify.com/s/files/1/0434/0976/8604/files/follow_me_tristam.pdf
    • https://cdn.shopify.com/s/files/1/0436/9973/2635/files/68378543924.pdf
    • https://cdn.shopify.com/s/files/1/0440/1207/7206/files/jazixalajidaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/5310/4790/files/baxijefonuta.pdf
    • https://cdn.shopify.com/s/files/1/0431/1898/5370/files/absceso_periapical.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_off00006f4e.bin
b091e0e3f9290d7047a7c1d3438f55e1830a73a4c1e1c80511184a190b48b6ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F4E 5296 bytes
font_01_sfnt_off0000811a.bin
b1ad170a9926bb3f09d6a346f760b956f2a9b81121ca0a3692dc6eee08acc47c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x811A 10524 bytes
font_02_sfnt_off0000a4e6.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4E6 4324 bytes

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