Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5d162de31226742…

MALICIOUS

PDF

44.1 KB Created: 2020-08-29 20:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 300ae3a521735cc9837f685777471c85 SHA-1: a9322fe4c943a64e4f0428d0fe51a178d8514077 SHA-256: d5d162de3122674259d590654f65ef294a579fcd91f4e224fb07abeecc9653ae
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one heuristic specifically identifying it as a 'PDF SEO Link Farm'. Another heuristic flags a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves redirecting users through a chain of links, potentially leading to malicious content or phishing sites.

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/wix?keyword=yuan+shao+total+war+guide
    • https://cdn.shopify.com/s/files/1/0433/2978/1918/files/90583160764.pdf
    • https://cdn.shopify.com/s/files/1/0437/7752/3873/files/velufiw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/redukenedobitaguwowok.pdf
    • https://static.usrfiles.com/ugd/b8c837_d4b78f0c91ff4000a4e5cf4d52f44875.pdf
    • https://static.usrfiles.com/ugd/b8c837_7bef9d7553bf483db6b99ee3ce34d3a3.pdf
    • https://static.usrfiles.com/ugd/b8c837_5e2332e9d968435c90a88c7900c7f6ca.pdf
    • https://cdn.shopify.com/s/files/1/0434/2933/1100/files/jabudiwaromosid.pdf
    • https://cdn.shopify.com/s/files/1/0430/0436/2906/files/ladazebapesuzikuxadu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6727/6454/files/tulumeteg.pdf
    • https://cdn.shopify.com/s/files/1/0432/9088/6312/files/pasejemepanape.pdf
    • https://cdn.shopify.com/s/files/1/0431/5981/4306/files/kitab_nasab_alawiyyin.pdf
    • https://cdn.shopify.com/s/files/1/0446/3670/0835/files/joxig.pdf
    • https://cdn.shopify.com/s/files/1/0438/1540/3682/files/adverb_phrases_worksheet.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_off00006f21.bin
a95c3eec889249d6d4f5157fd09cea666d3294476a2462fe62affe592cbceb59
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F21 5140 bytes
font_01_sfnt_off000080a0.bin
6ac35fd17fdee572ba88240e5441a54cb719ef249f38ae2fe91818adf81f08df
pdf-font-stream PDF embedded font (sfnt) at offset 0x80A0 10236 bytes