Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d23445ac1d545f…

MALICIOUS

PDF

38.9 KB Created: 2020-08-19 09:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bb5cf8b0272a8757f7451a777f30579 SHA-1: 0d6088c69582a3651567403531db1940aebfee43 SHA-256: 37d23445ac1d545f496e21a86a81fa5784d3fc60a01a50f04a83018fe4652888
154 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains numerous embedded URLs, with one prominent URL pointing to a known malicious redirector. The primary attack pattern involves luring users to click on these links, which likely lead to further malicious content or phishing attempts.

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=blowback+rubber+band+gun+template
    • http://tovalisu.maigretfamilyfarm.com/uploads/1/3/1/0/131070993/a0fbb4c.pdf
    • http://files.bepositivebeyou.com/uploads/1/3/0/7/130776619/baxutomaduler.pdf
    • http://files.parkesautodetailing.com/uploads/1/3/0/9/130969573/d946b622f.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8172/files/82601770136.pdf
    • https://cdn.shopify.com/s/files/1/0433/6576/1176/files/cnco_pretend_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23535065851.pdf
    • https://cdn.shopify.com/s/files/1/0434/0056/0805/files/nijadu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6921/0773/files/didako.pdf
    • https://cdn.shopify.com/s/files/1/0438/0501/6225/files/23269399531.pdf
    • https://cdn.shopify.com/s/files/1/0437/4927/7845/files/86768316296.pdf
    • https://cdn.shopify.com/s/files/1/0428/4294/7750/files/kokevifefusedibok.pdf
    • https://cdn.shopify.com/s/files/1/0434/7972/8281/files/suburban_noize_records.pdf
    • https://cdn.shopify.com/s/files/1/0433/4593/6534/files/gurone.pdf
    • https://cdn.shopify.com/s/files/1/0434/4892/6364/files/71713086638.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_off0000594b.bin
a27ba60fbd3858c6ddef06733bbf19b3d3a17281a127a90f128cebea576c222d
pdf-font-stream PDF embedded font (sfnt) at offset 0x594B 5560 bytes
font_01_sfnt_off00006c36.bin
d56c47214c0677bb93186bbe91e7b2dafc692008e0602619ecd9400c7a5ad0c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C36 10136 bytes