Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf9fe44f7a7878a…

MALICIOUS

PDF

49.9 KB Created: 2020-08-24 09:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ee6d5e9dce84009d4b731b15ad33b38 SHA-1: 2eac7a4d4162c5ab7e572d80d4a8b08ae33f8f73 SHA-256: 6bf9fe44f7a7878a345938ac251bc2502e365b1806b5c498ddb0880997ae5b56
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 directs to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL. This suggests the primary purpose is to redirect users to malicious content, likely for phishing or malware distribution.

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/pify?keyword=remington+chainsaw+manuals
    • http://lubijawan.innerframework.org/uploads/1/3/0/7/130776474/c33aa.pdf
    • http://files.constantcovering.com/uploads/1/3/1/4/131414516/ritarumusiset_faroni.pdf
    • http://files.cghcollectibles.com/uploads/1/3/0/9/130969352/fovipawasusasusis.pdf
    • http://dapud.yogadown.ca/uploads/1/3/1/3/131398024/nuwafularupokosewalu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/1165/4307/files/nawebumovusewa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2160/6818/files/vubat.pdf
    • https://cdn.shopify.com/s/files/1/0429/5743/9129/files/69004433733.pdf
    • https://cdn.shopify.com/s/files/1/0430/4715/7911/files/robert_bringhurst_elements_of_typographic_style.pdf
    • https://cdn.shopify.com/s/files/1/0430/9087/0423/files/mulazokuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/legokuxemalo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/fufuposobisefalam.pdf
    • https://cdn.shopify.com/s/files/1/0448/1295/9905/files/jexokewu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2871/6440/files/14493199840.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/52981928691.pdf
    • https://cdn.shopify.com/s/files/1/0435/7311/7086/files/xizinimexutokokexol.pdf
    • https://cdn.shopify.com/s/files/1/0431/8301/4048/files/autocad_commands_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/4460/8920/files/konuzerepukapiji.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32377204601.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_off000085ac.bin
d42800b77b9e43264b34dc228ee8cbe8e7e1eaac83c9865823239c48762ae371		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85AC 5216 bytes
font_01_sfnt_off0000975e.bin
5f54e988b1e027414743b4f2a3a6ccf7530c8f1f91b83203f5517e6f4f2f6f03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x975E 10436 bytes

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