Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9751be85a8d8c85…

MALICIOUS

PDF

44.4 KB Created: 2020-08-08 20:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f97dc11c1b7f35801eebc354b9fabf5a SHA-1: 456186c1a41cceb276bafe1006c403258db40400 SHA-256: a9751be85a8d8c85411af464c3f15177cee9b539cdd7ab28d488c772296b3405
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Addends

The PDF contains a large number of embedded links, identified as a link farm. One of these links, 'https://ttraff.ru/pify?keyword=abandono+y+maltrato+animal+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to lure users to malicious sites. The ML classifier strongly supports the malicious nature of this PDF.

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.ru/pify?keyword=abandono+y+maltrato+animal+pdf
    • http://wokogega.jonericschafer.com/uploads/1/3/1/0/131071164/mifizusuvegiv.pdf
    • http://wofuxejol.fropros.com/uploads/1/3/2/7/132710621/e3dbb1.pdf
    • http://files.cowgirlfaithbordercollies.com/uploads/1/3/0/9/130969190/5700778.pdf
    • http://files.kissmeforeverweddings.com/uploads/1/3/1/4/131437299/9a4385.pdf
    • https://cdn.shopify.com/s/files/1/0431/0564/8801/files/wivizevalonedapapup.pdf
    • https://cdn.shopify.com/s/files/1/0431/6341/8784/files/27905574333.pdf
    • https://cdn.shopify.com/s/files/1/0436/8039/9513/files/140783144.pdf
    • https://cdn.shopify.com/s/files/1/0431/7279/0427/files/80607973080.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/shinedown_diamond_eyes_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0430/3942/4669/files/57275974206.pdf
    • https://cdn.shopify.com/s/files/1/0435/1806/6843/files/47886190705.pdf
    • https://cdn.shopify.com/s/files/1/0434/5082/6905/files/gujexa.pdf
    • https://cdn.shopify.com/s/files/1/0433/4115/2421/files/83075881264.pdf
    • https://cdn.shopify.com/s/files/1/0431/9241/8468/files/japakutud.pdf
    • https://cdn.shopify.com/s/files/1/0429/1896/9507/files/libedajegonixugaxa.pdf
    • https://cdn.shopify.com/s/files/1/0432/1217/7572/files/56699176347.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_off00006f6e.bin
5810dbf4c7ff230a8cf17ba1fee6273e0a39fddd21ef77f37a60651a374349b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6E 5240 bytes
font_01_sfnt_off00008130.bin
b315a22bf55d0ddf4d10db90dcec365d2b36a65abbd0d1d937b1201c52853458
pdf-font-stream PDF embedded font (sfnt) at offset 0x8130 10432 bytes