Malicious PDF — malware analysis report

Static analysis result for SHA-256 658f74579fefb00a…

MALICIOUS

PDF

48.9 KB Created: 2020-08-19 18:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfdf513179ebf9c4f2bce42d1845507b SHA-1: 0523b35f649501789fb9a8018ecfca7227098856 SHA-256: 658f74579fefb00ac380cc7b53c8e74c69dfb1e0fffd8b47f93eef2cfaa7c687
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting PDF files, but one critical link redirects to a known malicious domain (ttraff.com). This suggests a link farm or SEO poisoning tactic designed to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=flyff+leveling+guide+acrobat
    • http://files.ps110q.org/uploads/1/3/1/3/131381919/vetutedirawudej.pdf
    • http://xidotok.lookylooseyewear.com/uploads/1/3/1/1/131164250/4391974.pdf
    • http://files.cedricstudios.com/uploads/1/3/1/8/131856163/941909.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7602/5501/files/the_respect_principle_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0144/files/17910998621.pdf
    • https://cdn.shopify.com/s/files/1/0428/7044/0095/files/fivotegexuputomevapitata.pdf
    • https://cdn.shopify.com/s/files/1/0431/0089/7434/files/63058625158.pdf
    • https://cdn.shopify.com/s/files/1/0430/8231/7975/files/top_of_the_world_carpenters_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0430/7540/3936/files/diwiluwutevavaremomajem.pdf
    • https://cdn.shopify.com/s/files/1/0433/0173/2520/files/52760146091.pdf
    • https://cdn.shopify.com/s/files/1/0428/8646/3647/files/fatakidetuzazajinerupef.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/88075317933.pdf
    • https://cdn.shopify.com/s/files/1/0429/9948/0473/files/36688728024.pdf
    • https://cdn.shopify.com/s/files/1/0427/8022/9791/files/november_2020_calendar_with_holidays.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_off000080e5.bin
da28a086a9333044a22bae955dae3c31b4e3827d7c89444e3ff19073d27b790c
pdf-font-stream PDF embedded font (sfnt) at offset 0x80E5 5268 bytes
font_01_sfnt_off000092f3.bin
850e8242d7c9f081a23a5b816b5d9fc078347844da50cae7b47ffa72a599ec49
pdf-font-stream PDF embedded font (sfnt) at offset 0x92F3 10536 bytes