Malicious PDF — malware analysis report

Static analysis result for SHA-256 78301f1338d99ac7…

MALICIOUS

PDF

45.4 KB Created: 2020-08-08 16:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11afc3dd1f17c677e6119cfaad5dff25 SHA-1: 20dd562b31338e11bf7545861ae5969c1eb72bc9 SHA-256: 78301f1338d99ac70d339124446c011d332e6f5cc6e0edaf5924f13f71521ebe
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to external PDF files, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which likely serves as a gateway to further malicious content. The document body also contains the phrase 'Javascript tutorial pdf download free', which is likely a lure to attract victims to click on the malicious links.

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.ru/pify?keyword=javascript+tutorial+pdf+download+free
    • http://files.terricohn.com/uploads/1/3/1/3/131381681/mujitiko.pdf
    • http://files.annaparkernaples.com/uploads/1/3/0/7/130739919/8324550.pdf
    • http://files.stbrigidstaugustinepartnership.org/uploads/1/3/1/4/131437889/lajarodusipa.pdf
    • http://files.mhecblacon.com/uploads/1/3/1/4/131437351/vasak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/texirid.pdf
    • https://cdn.shopify.com/s/files/1/0429/5314/6517/files/62141545401.pdf
    • https://cdn.shopify.com/s/files/1/0430/1173/5705/files/jezevogesinifodanariga.pdf
    • https://cdn.shopify.com/s/files/1/0433/7860/6229/files/mobawevijetileduzogivapol.pdf
    • https://cdn.shopify.com/s/files/1/0431/3546/7669/files/bapofarekul.pdf
    • https://cdn.shopify.com/s/files/1/0428/6667/1782/files/lewiston_me_weather.pdf
    • https://cdn.shopify.com/s/files/1/0437/7618/0376/files/xolaninojudiwowazidebali.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/golalebilafofuzugetuvi.pdf
    • https://cdn.shopify.com/s/files/1/0433/1972/2152/files/66238998793.pdf
    • https://cdn.shopify.com/s/files/1/0432/2476/0488/files/rafeso.pdf
    • https://cdn.shopify.com/s/files/1/0437/4275/7029/files/26202831214.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e3c.bin
1505f705b05eed44c4ebe952f5d85d6a02bb547ea3987893a03b54b5635fb0a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E3C 5292 bytes
font_01_sfnt_off00007064.bin
b5ca3c77373bade409f02c8909e9205418c6c404a9db5de6a5da380fad0cacc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7064 10048 bytes
font_02_sfnt_off00009301.bin
67bcfb7c388726f5c3b45134396d4daeb52989b52d679508e6f393a01196499c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9301 16088 bytes

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