Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c92acd829e9b9d9…

MALICIOUS

PDF

70.1 KB Created: 2020-08-31 02:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b10ae21c30ee93f06f1c45592b70d1ea SHA-1: 6b5ab8017e6d1c28dbd60243f86d742ca54a7704 SHA-256: 5c92acd829e9b9d99913618d5c27d05b4561b4f9a98b0d4f6cd32a7adf5aebe2
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised with a seemingly academic keyword. This link points to `https://ttraff.ru/wix?keyword=stokes+theorem+proof+pdf`, which is flagged as malicious infrastructure. The document also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify. The ML classifier strongly indicates maliciousness, and the overall structure suggests a phishing or scam attempt.

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/wix?keyword=stokes+theorem+proof+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/6345/9496/files/82344241254.pdf
    • https://cdn.shopify.com/s/files/1/0435/2845/4304/files/campagnolo_khamsin_asymmetric.pdf
    • https://cdn.shopify.com/s/files/1/0431/4041/5644/files/dvt_in_pregnancy_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0436/0758/9027/files/7730242137.pdf
    • https://cdn.shopify.com/s/files/1/0440/3996/2774/files/bitakewazigumojenovulo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xovigaza.pdf
    • https://cdn.shopify.com/s/files/1/0434/6062/4549/files/brotherhood_song_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0431/7777/1162/files/95993537284.pdf
    • https://static.usrfiles.com/ugd/ec0c41_c4bafdf8be90414a978082da54eab12d.pdf
    • https://static.usrfiles.com/ugd/41a0b6_01a0df1dbb9e4bb38790e2a466dd395b.pdf
    • https://static.usrfiles.com/ugd/73c254_e541b05a27064cf6ac0960a126ea3ce8.pdf
    • https://static.usrfiles.com/ugd/455f95_5a909fef84b844bf86627b1c3ba25d0b.pdf
    • https://static.usrfiles.com/ugd/cc14e4_5bced8a1d72f41f89d9b68c72128fdcc.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_2408ce6b6d3543e2aa7ff2da0e73d2dd.pdf
    • https://static.usrfiles.com/ugd/ea5d7b_8196204fe46046819537e29a16144227.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a57c.bin
9a7f0380a89878b70d5da32a6e41ccd8ade2841cb7fa0e283802272cec7ff5da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA57C 4840 bytes
font_01_sfnt_off0000b5e5.bin
bc090bf9db04797dae911b3585c8f0977fcbfeaba589fde4c19c4f445eeddb41		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E5 14792 bytes
font_02_sfnt_off0000e495.bin
a1cf5bc8665de35447770083f7d2202adae9c9255f84df0689160a542241f928		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE495 16864 bytes
font_03_sfnt_off0000fcb1.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB1 4324 bytes

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