Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4c520bc1aef8b5…

MALICIOUS

PDF

39.4 KB Created: 2020-08-12 00:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bf41ef6db79a46122291b0d5bde9f2b SHA-1: ea60c2909313e6cdebdb19060581103080613fc4 SHA-256: 6a4c520bc1aef8b505ca37d6a169bf5b937e4a2f94200eed275efbbbf2ceaa24
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to searching PDFs and includes URLs that are part of a link farm. This suggests the primary goal is to drive traffic to malicious or spam-related websites, potentially for phishing or SEO manipulation.

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=search%20pdfs%20for%20text
    • http://files.penntownshipfire.com/uploads/1/3/0/7/130776298/e4c73db6ac.pdf
    • http://files.guardiangrouptravel.com/uploads/1/3/1/4/131406811/1498498.pdf
    • http://files.brianagantsweg.com/uploads/1/3/2/6/132683070/dinikimedatifo-tetifun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/8071/8238/files/jomamugolelufejijubifem.pdf
    • https://cdn.shopify.com/s/files/1/0428/3128/2335/files/17097300976.pdf
    • https://cdn.shopify.com/s/files/1/0444/3540/7014/files/remove_xbox_game_bar.pdf
    • https://cdn.shopify.com/s/files/1/0448/1295/9905/files/jexokewu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0644/3163/files/lunutewanizi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6585/1542/files/namasipe.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/wogesigopen.pdf
    • https://cdn.shopify.com/s/files/1/0433/3846/5435/files/25599407741.pdf
    • https://cdn.shopify.com/s/files/1/0435/7111/8235/files/wuludozuzofazetufijozar.pdf
    • https://cdn.shopify.com/s/files/1/0438/6160/6550/files/analytical_methods_in_supramolecular_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0432/2718/5316/files/89697864876.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_off00005c60.bin
c72d3926d669a0dffe54ac619362bf69f39691b9e2495c469b510b2abf1cd809
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C60 5380 bytes
font_01_sfnt_off00006ea8.bin
17a7e142378754cfe1556b10ff1b85ae31ee52b05a65a6967e26e97bcd706e93
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA8 10240 bytes