Malicious PDF — malware analysis report

Static analysis result for SHA-256 6324a2e35dab3248…

MALICIOUS

PDF

45.6 KB Created: 2020-09-10 22:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8605ed1d374f79303baf5ee98217c77 SHA-1: 4432676107df36fce645774da56ad98beb6a9820 SHA-256: 6324a2e35dab3248992d7da9e0f9cfaa9a5de8c07fd256eb98c18112a1cf00ea
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to domains associated with link farms and redirectors, as indicated by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs are likely intended to lead users to malicious sites for further exploitation or phishing.

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.club/wix?keyword=cookie+sheet+chicken+pizza
    • http://files.catnip4cats.com/uploads/1/3/0/8/130814258/a251c.pdf
    • http://files.aartismithmadan.com/uploads/1/3/1/1/131164129/68c89870.pdf
    • http://werute.insightenergy.ca/uploads/1/3/1/6/131636725/6da0c528cfc4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6481/1935/files/61741217369.pdf
    • https://cdn.shopify.com/s/files/1/0431/8239/1451/files/pifore.pdf
    • https://cdn.shopify.com/s/files/1/0434/7396/1110/files/33467385538.pdf
    • https://cdn.shopify.com/s/files/1/0432/6598/2632/files/bisuvufok.pdf
    • https://cdn.shopify.com/s/files/1/0437/0133/8280/files/zopixiralitip.pdf
    • https://static.usrfiles.com/ugd/b48b60_54633374f98d4e2d888b13e9ccd36aa5.pdf
    • https://static.usrfiles.com/ugd/f2ef67_64a05106eef94f87b7ee5fa27d23eb43.pdf
    • https://static.usrfiles.com/ugd/b463f2_6e7877cca6994c6fb66d3c85d1b95268.pdf
    • https://static.usrfiles.com/ugd/b58d21_57b4e7b303924d45946df77f2cdf5312.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c50.bin
cbf805810b6e77e584718dc9488a813a192c453fa5f0a30a539c7123c8e77c83
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C50 4912 bytes
font_01_sfnt_off00007d08.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D08 1800 bytes
font_02_sfnt_off00008596.bin
03ad783bf99c0df9cfbee4fe80a128adaa9f57fb06da06bf257046c0694997a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x8596 10420 bytes