Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c54f017911e61d7…

MALICIOUS

PDF

46.1 KB Created: 2020-08-29 17:25:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81c95db96099f7c0d8771dcec3c66264 SHA-1: 269e6ac49a2a3fa7c5308f10748fca9d497c66fa SHA-256: 0c54f017911e61d70a164d57391577810a3f1b011b92de910aa0f27a409e99ec
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a worksheet, which is a common lure. The presence of numerous Shopify links, many flagged as benign, suggests a link farm intended to obscure the malicious redirector. No scripts were extracted, but the PDF structure and embedded links indicate a phishing or malware distribution 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.com/wix?keyword=systems+of+inequalities+worksheet+do
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0470/6123/7928/files/sybex_ccna_study_guide_7th_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2836/files/12428936125.pdf
    • https://cdn.shopify.com/s/files/1/0431/0476/4068/files/pekusavizowuzikuxire.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2342/files/96646434085.pdf
    • https://cdn.shopify.com/s/files/1/0437/5108/0090/files/sibirakifumezamomukowop.pdf
    • https://cdn.shopify.com/s/files/1/0434/2782/3778/files/aahista_pukaro_song.pdf
    • https://cdn.shopify.com/s/files/1/0433/1149/7366/files/28610699764.pdf
    • https://cdn.shopify.com/s/files/1/0429/6491/0243/files/licence_pro_informatique_alternance_bordeaux.pdf
    • https://cdn.shopify.com/s/files/1/0437/9069/6597/files/watch_pineapple_express_online_free.pdf
    • https://static.usrfiles.com/ugd/b8c837_548c94c05dee4178b9bbfeab9398e19c.pdf
    • https://static.usrfiles.com/ugd/b8c837_f7d06ffd7ee54146a207f73ea5f90603.pdf
    • https://static.usrfiles.com/ugd/b8c837_d68c6f48aa114e01934e7c0366e1c7f3.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9a69bcc4ee8492594ddbdeac6519153.pdf
    • https://static.usrfiles.com/ugd/b8c837_02fcd7a8c76540ff8357d32089e30245.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_off000068f5.bin
9bae5670de5c72c58de405e947281937f97b52bf9d9c3372a254b36e15c49424		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68F5 5516 bytes
font_01_sfnt_off00007b88.bin
46c53ccd98761972b5a06967dff9b80e34d6795a00a42922f088e3be60aa3c90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B88 9964 bytes
font_02_sfnt_off00009dab.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DAB 4324 bytes

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