Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b0c5ef163cf255…

MALICIOUS

PDF

50.2 KB Created: 2020-08-29 21:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5fa289e4a05db3007fca0414e219bfbc SHA-1: 38d90cd7813249c4dc92c8f214b84d67e8bb1e1e SHA-256: 61b0c5ef163cf255e870bf2564ab4c0314ca6f5529ba3efd9fb65d6781ef2cfc
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 Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic designed to drive traffic to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of embedded URLs and the heuristic firings indicate a malicious redirection 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.cc/wix?keyword=voters+guide+texas+primary+2014
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3340/3285/files/mike_epps_baby_mama.pdf
    • https://cdn.shopify.com/s/files/1/0433/5091/7269/files/zezupelekuzuk.pdf
    • https://cdn.shopify.com/s/files/1/0427/7341/4055/files/88353602622.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/81638228030.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5312/files/atlanta_hawks_schedule.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0417/files/59544302509.pdf
    • https://cdn.shopify.com/s/files/1/0438/6196/7013/files/73410987277.pdf
    • https://cdn.shopify.com/s/files/1/0440/8626/3960/files/bapivoxalemekurisa.pdf
    • https://cdn.shopify.com/s/files/1/0460/2255/7855/files/last_week_tonight_episode_guide_tv.com.pdf
    • https://static.usrfiles.com/ugd/b8c837_a8977a81fa1544d79f2289a7fe1f5aff.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2f96d5e319c4ed686aed994d590cb72.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c183f253f8f4238940474038910a9e3.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c9ac6d87a2b44e1a8b8648094a9387c.pdf
    • https://static.usrfiles.com/ugd/b8c837_63be9aad80654b8fbedc3e38fa9dc152.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_off00008523.bin
93ee15ca20671d3816d103297b30e25b52e866030ec0a7941bbe719d15fd4be1
pdf-font-stream PDF embedded font (sfnt) at offset 0x8523 5796 bytes
font_01_sfnt_off000098e8.bin
38fa101c21cbbe3c34e9e3bb6cb47abc916316065fb55c62c15eed64e439523a
pdf-font-stream PDF embedded font (sfnt) at offset 0x98E8 10288 bytes