Malicious PDF — malware analysis report

Static analysis result for SHA-256 e28ab7f4d743daee…

MALICIOUS

PDF

46.6 KB Created: 2020-08-02 05:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35417eaba5b96275a122c744b8907594 SHA-1: f047a37a8aaa32c6722ebade903d5a14008eaed6 SHA-256: e28ab7f4d743daee351f5075d607ff973dca5b41dbeb30ba93d4c6816b6b4700
152 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 pointing to Shopify domains hosting other PDFs, a technique often used for SEO poisoning or to obscure malicious redirects. One critical heuristic identified a link to a known malicious redirector, ttraff.com. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the link farm and redirector heuristic suggest the primary goal is to drive traffic to malicious infrastructure.

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=lil+whyte+album
    • http://files.mamdouh.co/uploads/1/3/1/3/131398036/kifatizofeguwaj_befat_devuwisale_bemuzamot.pdf
    • http://files.susancontini.com/uploads/1/3/0/9/130969507/9084485.pdf
    • http://files.lyonstownship.org/uploads/1/3/0/8/130874257/guvaleju_nepomiw_mumotul_kebovuxuvej.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wopeg.pdf
    • https://cdn.shopify.com/s/files/1/0429/8987/9445/files/dobikaroxetir.pdf
    • https://cdn.shopify.com/s/files/1/0434/1537/1932/files/togebogabo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5759/4016/files/93598475632.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6271/files/vukikaxomudofupoweraw.pdf
    • https://cdn.shopify.com/s/files/1/0432/2987/2292/files/relubijikobobifopapag.pdf
    • https://cdn.shopify.com/s/files/1/0427/7947/6134/files/79598732358.pdf
    • https://cdn.shopify.com/s/files/1/0440/5608/4630/files/loloxedaxogipasadatoko.pdf
    • https://cdn.shopify.com/s/files/1/0432/3436/1503/files/wureridopilekiri.pdf
    • https://cdn.shopify.com/s/files/1/0433/6458/1525/files/pizepijemezerenojonegi.pdf
    • https://cdn.shopify.com/s/files/1/0434/9244/2264/files/53735633321.pdf
    • https://cdn.shopify.com/s/files/1/0428/9649/0663/files/werarunekinigazumutovutiz.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9341/files/38042076383.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_off00006d52.bin
33f25ef543e6d12889de3687f4946385a104ac57bf25a92c8cad0cf4c082e0a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D52 4924 bytes
font_01_sfnt_off00007e0b.bin
6da3cceb86277732ffd3b423d14dd8cd492612576dc93c1925c423c94abe1bd9
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E0B 15304 bytes