Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d15215f0677429a…

MALICIOUS

PDF

39.1 KB Created: 2020-08-12 09:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 871165034de2e6b8cb8afdbb9d16f685 SHA-1: 5f6e2a96b139172483bed15158b1f4b0752ec192 SHA-256: 6d15215f0677429a82e14edcff12e3786428b18d47de46adb172aa9bcf214e56
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link redirects to known malicious infrastructure. The document body, though heavily obfuscated, contains text related to 'multiplication worksheets' and a URL that appears to be a lure. The presence of numerous links suggests a link farm or SEO poisoning attempt, with the primary malicious link likely intended to lead the user to a phishing or malware download site.

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.cc/wb?keyword=multiplication%20worksheets%20decimals%20grade%206
    • http://nutige.ilovebuttercups.com/uploads/1/3/2/8/132814930/8752506.pdf
    • http://files.ackthaihouse.com/uploads/1/3/1/6/131637074/c59c0dcd.pdf
    • http://files.neilestrickgallery.com/uploads/1/3/2/8/132815388/d40bcd.pdf
    • http://files.khbblaw.com/uploads/1/3/1/4/131438111/608d7449f4f14e0.pdf
    • http://files.psychiatristsofdenver.com/uploads/1/3/0/8/130814110/5017681.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3080/5653/files/blockhaus_stuttgart_speisekarte.pdf
    • https://cdn.shopify.com/s/files/1/0429/3384/6175/files/liftmaster_888lm_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/2868/3672/files/hyde_park_chicago_zip_codes.pdf
    • https://cdn.shopify.com/s/files/1/0431/1475/8293/files/gakonijesevipesaj.pdf
    • https://cdn.shopify.com/s/files/1/0438/5121/9104/files/85145404234.pdf
    • https://cdn.shopify.com/s/files/1/0430/1560/2337/files/situvovuxomakagubok.pdf
    • https://cdn.shopify.com/s/files/1/0429/1543/0553/files/lezunasitunapeserupezenam.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vinujavezo.pdf
    • https://cdn.shopify.com/s/files/1/0435/3051/8682/files/13220546829.pdf
    • https://cdn.shopify.com/s/files/1/0428/1267/0111/files/fepokibuzabiwadozip.pdf
    • https://cdn.shopify.com/s/files/1/0447/0875/7660/files/75071876969.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058d1.bin
45ce973f57e7447912a4c1bc0265cc3577f786a5532b99dc13cced941acc0642		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58D1 5800 bytes
font_01_sfnt_off00006c79.bin
6e386557298bf2af50e415203e08f6895ed7327b59b420f65aeb1d57fce525fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C79 10268 bytes

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