Malicious PDF — malware analysis report

Static analysis result for SHA-256 7042b4ebf9fe7181…

MALICIOUS

PDF

53.5 KB Created: 2020-08-16 23:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0df3e0d95701b4f0c6d1b5936651cab4 SHA-1: 3d6307144e77219a420734db1be1767b5520ca2b SHA-256: 7042b4ebf9fe7181ec6ff05ae342084f5587b632377b858aec2df27d0d418f30
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a pattern of link farming or SEO spam, likely intended to drive traffic to malicious sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious redirector suggests an attempt to lead the user to a compromised or malicious website.

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=formica+calacatta+marble+edge
    • http://files.fiddlersgreenaussies.net/uploads/1/3/1/3/131380213/428ee7d4273b.pdf
    • http://lemimepu.darilyntyrese.com/uploads/1/3/2/6/132683209/zegeporokalokosunapo.pdf
    • http://files.autismcenterkenya.org/uploads/1/3/0/7/130776054/7364049.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9661/2768/files/59546199181.pdf
    • https://cdn.shopify.com/s/files/1/0430/8231/7975/files/books_by_aleister_crowley.pdf
    • https://cdn.shopify.com/s/files/1/0437/6713/6408/files/5071405308.pdf
    • https://cdn.shopify.com/s/files/1/0433/3296/0409/files/bts_erpc.pdf
    • https://cdn.shopify.com/s/files/1/0430/4093/1991/files/xedezisupeme.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44994208471.pdf
    • https://cdn.shopify.com/s/files/1/0434/4964/7261/files/nugejobotekawefetodolager.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_off000085e1.bin
7e897d8b8a5928eaa9d293cdd3b0238bbd1a74c81c14bc275b838699ba21290c
pdf-font-stream PDF embedded font (sfnt) at offset 0x85E1 5176 bytes
font_01_sfnt_off0000975c.bin
905918b9518285553f734eb995f3797dc11572a4aba1cd7cfa1a212fd8356391
pdf-font-stream PDF embedded font (sfnt) at offset 0x975C 16292 bytes