Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79791fb633d10d5…

MALICIOUS

PDF

47.0 KB Created: 2020-08-13 07:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c80aef4ea2d461db595788e7db74684a SHA-1: 08555b6865a81450fd2817af641c598b72826626 SHA-256: b79791fb633d10d5c77570e8e316cb5ff3499fdfbd0e65214f0057a7f074bf71
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure via the URL 'https://ttraff.com/pify?keyword=estudio+agrologico+v+region+pdf'. Additionally, it contains a large number of embedded links, many pointing to Shopify-hosted PDFs, indicating a potential link farm or SEO manipulation strategy. 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=estudio+agrologico+v+region+pdf
    • http://files.comechatwidmi.tv/uploads/1/3/1/6/131606390/tisitox_jifudopibi.pdf
    • http://tirugeg.westchestercounties.com/uploads/1/3/1/1/131164250/ximukiwafazavodez.pdf
    • http://files.tucsonoldpueblodar.org/uploads/1/3/2/6/132681488/f1096.pdf
    • http://files.myfriendsimonee.com/uploads/1/3/0/8/130874189/kevasopaj_kiduxurodudi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0377/2056/files/nosuvane.pdf
    • https://cdn.shopify.com/s/files/1/0440/7610/5893/files/fajomanijomatobupegimak.pdf
    • https://cdn.shopify.com/s/files/1/0434/0318/2231/files/naxerijopasasumom.pdf
    • https://cdn.shopify.com/s/files/1/0431/8943/6580/files/bikodenumake.pdf
    • https://cdn.shopify.com/s/files/1/0428/1755/2543/files/98758746628.pdf
    • https://cdn.shopify.com/s/files/1/0440/5365/9798/files/vetipakoxofalipola.pdf
    • https://cdn.shopify.com/s/files/1/0429/5104/9370/files/calicivirus_felino_patogenia.pdf
    • https://cdn.shopify.com/s/files/1/0431/6332/0469/files/raburidivuvulifopekufakom.pdf
    • https://cdn.shopify.com/s/files/1/0431/3156/8277/files/articulacion_hombro.pdf
    • https://cdn.shopify.com/s/files/1/0439/9860/9566/files/small_basic_programming.pdf
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/core_stone_embers.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_off0000785d.bin
84d11c505cda97c2f6c259aa12a1ddafeffccdff508c4963b97b7b99abf36aa3
pdf-font-stream PDF embedded font (sfnt) at offset 0x785D 5340 bytes
font_01_sfnt_off00008aa2.bin
8294bf732cfe2457183caa7758f4ab127654ca95fdd59c30f69431b1726d4345
pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA2 10872 bytes