Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9c268ed87fc8c5…

MALICIOUS

PDF

52.4 KB Created: 2020-08-09 03:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7ce54e8267e66c935bff5961e0cdca9 SHA-1: 18839344dae6c1f3def4dcdc8c0fd45d2704e853 SHA-256: 7f9c268ed87fc8c55fd2a843fe65f3771dd179487c436cf35482ac7527e72e17
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=vengeful+ve+schwab+pdf'. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's part of a link farm designed to distribute malicious content. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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.cc/pify?keyword=vengeful+ve+schwab+pdf
    • http://files.evolvecounselingoflansing.com/uploads/1/3/1/3/131383247/cca1c.pdf
    • http://files.espgallery.com/uploads/1/3/0/8/130813373/8882453.pdf
    • http://zitikupo.sheltonprivatevoicestudio.com/uploads/1/3/1/3/131379730/zedule.pdf
    • http://files.kemuda.net/uploads/1/3/0/7/130775698/6269101.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/4686/8891/files/605228457.pdf
    • https://cdn.shopify.com/s/files/1/0428/0470/7491/files/78153040417.pdf
    • https://cdn.shopify.com/s/files/1/0450/8103/4917/files/origami_bat_instructions.pdf
    • https://cdn.shopify.com/s/files/1/0433/9813/5966/files/nordvpn_coupon_reddit.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nubizasijimowedemo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4610/9345/files/tafigikadipajegokutuf.pdf
    • https://cdn.shopify.com/s/files/1/0427/4916/5734/files/sotusigogovabolipasip.pdf
    • https://cdn.shopify.com/s/files/1/0429/8552/1311/files/basics_of_mechanical_engineering_drawing.pdf
    • https://cdn.shopify.com/s/files/1/0437/4652/5338/files/sagugumuwamilimu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5776/files/49696710720.pdf
    • https://cdn.shopify.com/s/files/1/0440/9776/5528/files/65297965392.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008bad.bin
b5eb1b1f72950244078715d3067860eaa8ff518519f58199b83133f82b0e6e41
pdf-font-stream PDF embedded font (sfnt) at offset 0x8BAD 5580 bytes
font_01_sfnt_off00009ece.bin
2532eaace439210d4df2457532519be846f63c7cbf50ffe8de25f0bf0749ee0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9ECE 11696 bytes