Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8094d26036541a…

MALICIOUS

PDF

51.7 KB Created: 2020-07-30 13:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3fb019936bd28ea3c5e16a31ad6775b SHA-1: 4915e2beb54ad1295154395de8f3276c6bc1e2e2 SHA-256: bb8094d26036541ab377009ddfd7dfc392c8408c242af3ca9fff269875266d90
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to SEO-optimized PDF files hosted on various domains, including cdn.shopify.com. One critical heuristic identified a link to a known malicious redirector at 'ttraff.com'. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its direct lure, but the link farm and redirector strongly suggest a phishing or malware distribution attempt.

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=birdlike+freddie+hubbard+pdf
    • http://files.liatelbling.com/uploads/1/3/2/6/132682639/puzam_pewedod.pdf
    • http://files.frankpaur.com/uploads/1/3/0/8/130874139/gulorerijolen-relulawazol.pdf
    • http://files.nedlerpalaz.com/uploads/1/3/1/4/131454692/gesavar.pdf
    • http://files.bobericphotography.com/uploads/1/3/1/3/131398473/wiwolorirenanavig.pdf
    • http://files.darkrisingseries.com/uploads/1/3/0/7/130739233/2182702.pdf
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/derero.pdf
    • https://cdn.shopify.com/s/files/1/0428/7981/1750/files/puzatanowurutewezar.pdf
    • https://cdn.shopify.com/s/files/1/0431/4795/2292/files/71279196161.pdf
    • https://cdn.shopify.com/s/files/1/0433/9469/5329/files/59108617731.pdf
    • https://cdn.shopify.com/s/files/1/0428/4196/4710/files/47698857111.pdf
    • https://cdn.shopify.com/s/files/1/0428/4727/3116/files/63799996123.pdf
    • https://cdn.shopify.com/s/files/1/0437/2656/9633/files/50951419367.pdf
    • https://cdn.shopify.com/s/files/1/0429/6641/7571/files/65216066893.pdf
    • https://cdn.shopify.com/s/files/1/0427/7541/2902/files/27048324408.pdf
    • https://cdn.shopify.com/s/files/1/0438/9647/1707/files/pilob.pdf
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/24633679908.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_off000082a4.bin
b2bfd4f3495fb20db60dcf759359d5aa3199faccf976885e8679ef53d0a40380
pdf-font-stream PDF embedded font (sfnt) at offset 0x82A4 4788 bytes
font_01_sfnt_off000092ec.bin
0afd19750fb5ce90bb867800d3d175194f1ef77b7aaa2945d04fd6be2e768620
pdf-font-stream PDF embedded font (sfnt) at offset 0x92EC 15020 bytes