Malicious PDF — malware analysis report

Static analysis result for SHA-256 76378bae07a73ea5…

MALICIOUS

PDF

44.5 KB Created: 2020-08-14 19:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa8bf8d870b3068be90385f3a768a8a8 SHA-1: 1fac97cddfad1ddc6812e9a635cfcf42b797050f SHA-256: 76378bae07a73ea5cb0a2d6436ea14f9d345fcc0d3760f8bdecb8d04e2bd3b86
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests an attempt to distribute malicious content or phish users. The document body, though partially corrupted, contains text related to 'Windows 10 enterprise' and a URL, reinforcing the lure.

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/pify?keyword=windows+10+enterprise+latest+iso+direct
    • http://files.samsschoolofmusic.com/uploads/1/3/1/4/131410685/dakosekivitefizix.pdf
    • http://files.downtownldnliving.ca/uploads/1/3/1/4/131438847/pareduvevupe.pdf
    • http://sikabifiv.tdcwebstercity.com/uploads/1/3/2/3/132303072/1638387.pdf
    • http://vosalo.dallashomeaudio.com/uploads/1/3/1/6/131606490/4876440.pdf
    • http://files.angellameanix.co/uploads/1/3/0/7/130738758/figavuji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/7596/8928/files/41624221460.pdf
    • https://cdn.shopify.com/s/files/1/0434/1848/4888/files/wuwosutokirevumakak.pdf
    • https://cdn.shopify.com/s/files/1/0432/2181/1362/files/pokimalifuworobelugedo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5524/2655/files/7517336657.pdf
    • https://cdn.shopify.com/s/files/1/0431/2917/6232/files/depogozef.pdf
    • https://cdn.shopify.com/s/files/1/0432/1266/9089/files/kufusa.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/folazugumawavazaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/9000/9502/files/21221975277.pdf
    • https://cdn.shopify.com/s/files/1/0431/0751/6565/files/tangled_full_movie_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/0319/1193/files/60210062334.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0133/files/71936809991.pdf
    • https://cdn.shopify.com/s/files/1/0435/3340/2266/files/dabajudufasuripimibini.pdf
    • https://cdn.shopify.com/s/files/1/0436/0994/8322/files/cadena_de_valor_porter.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_off000062f3.bin
4eaf47e41bdb340c5747f7b26cc428d91cc337026f9d1ece8952913d829d2a15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62F3 5156 bytes
font_01_sfnt_off00007496.bin
ef6340435e3c674a28a5843e87e2a37f0413956e667e3cd243273a54e9520660		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7496 10004 bytes
font_02_sfnt_off000096dd.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96DD 4324 bytes

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