Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f8c87cd3730d1f…

MALICIOUS

PDF

44.4 KB Created: 2020-07-08 12:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e57d042d0a2fda2125bb8c088a4a0e10 SHA-1: f38418f22d15a20b0b7b49d6033cec86831db07e SHA-256: a7f8c87cd3730d1f02ff201d8240a37819003a831472a69e3e848e24f9a8ae63
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm designed to host SEO-optimized PDF documents. One of the primary links redirects to malicious infrastructure via ttraff.cc. The ML classifier also strongly indicated maliciousness. No scripts were extracted from this sample.

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=correlational%20design%20research%20pdf
    • http://files.maddiehulsman.com/uploads/1/3/0/8/130873987/6938311.pdf
    • http://files.villariwestboro.com/uploads/1/3/1/0/131070523/baxurodikobelozidofi.pdf
    • http://files.belllog.org/uploads/1/3/0/7/130775827/2358242.pdf
    • http://files.roboticsandlocomotionlab.com/uploads/1/3/0/8/130873830/6752888.pdf
    • http://files.sweetbabiesdayhome.com/uploads/1/3/2/7/132740320/zipud_wenuv_soraminudej.pdf
    • http://files.liftoff-travel.co.uk/uploads/1/3/2/6/132682040/xivokima.pdf
    • http://files.theskinthatburns.com/uploads/1/3/1/1/131164534/f66e7e2f6bf.pdf
    • http://files.batrssocal.com/uploads/1/3/1/3/131384789/vipibifoxoteroxu.pdf
    • http://files.hordlevoluntarycare.org/uploads/1/3/0/8/130874413/zoladamalija.pdf
    • http://files.stribbledistrict.com/uploads/1/3/1/8/131856430/8390719.pdf
    • https://kuxuledexew.files.wordpress.com/2020/06/76673209127.pdf
    • https://mitugopagav.files.wordpress.com/2020/07/64956738767.pdf
    • https://dipirikufuda.files.wordpress.com/2020/06/pelikijop.pdf
    • https://tuforomo.files.wordpress.com/2020/06/15784288538.pdf
    • https://suzoxafa.files.wordpress.com/2020/06/torezapirifirefuvakume.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007094.bin
a78a4d82368ac7bd2b9e0066d79cb44dc3b08cbc6d7d0f16f043cc09b58dcd46
pdf-font-stream PDF embedded font (sfnt) at offset 0x7094 5228 bytes
font_01_sfnt_off00008255.bin
cd9a4303fb3513259bd0bb024a32f521b6fdb7e73aa0b2ba77a29ed1de79f9ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x8255 10408 bytes