Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b7956fb9049bfb…

MALICIOUS

PDF

53.3 KB Created: 2020-08-07 06:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1d66898498979efeb1cf871e99d4650 SHA-1: 338cc56510983e9e7ca32f774d3aa0a3a893564a SHA-256: 91b7956fb9049bfb9c5eba7ea9469643be512b254be3b335cb7791eb0b593f62
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a malicious redirector URL, indicating a phishing or scam attempt. The primary malicious URL is https://ttraff.com/pify?keyword=james+stockdale+courage+under+fire+pdf, which likely leads to further malicious content. The ML classifier strongly flagged this PDF as malicious.

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=james+stockdale+courage+under+fire+pdf
    • http://files.deboethiopia.org/uploads/1/3/1/6/131606115/7e53f99bbe8c47.pdf
    • http://files.aclickawaytraining.com/uploads/1/3/1/3/131379706/8200314.pdf
    • http://files.bedfellowsmagazine.com/uploads/1/3/1/1/131163687/0499d21d4c0b6.pdf
    • https://cdn.shopify.com/s/files/1/0440/6099/9830/files/31717735688.pdf
    • https://cdn.shopify.com/s/files/1/0437/6772/6232/files/dolekavejo.pdf
    • https://cdn.shopify.com/s/files/1/0436/9983/0952/files/craigslist_free_stuff_sacramento_cal.pdf
    • https://cdn.shopify.com/s/files/1/0437/6713/6413/files/ruwugojelekazajubetas.pdf
    • https://cdn.shopify.com/s/files/1/0434/8903/4402/files/harbor_breeze_ceiling_fan_remote_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/4762/3592/files/speaking_english_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0431/0728/7197/files/65704985118.pdf
    • https://cdn.shopify.com/s/files/1/0435/7190/4673/files/50754818736.pdf
    • https://cdn.shopify.com/s/files/1/0430/8749/5322/files/lowusuxazisububabamebotoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/7473/9607/files/nvidia_drivers_for_ubuntu_14._04.pdf
    • https://cdn.shopify.com/s/files/1/0431/9988/9569/files/70443210606.pdf
    • https://cdn.shopify.com/s/files/1/0431/2753/7828/files/zuwuf.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_off000091b9.bin
f92319672e4894a90d405ea1069aa3bb645e869559626004489007b67643443e
pdf-font-stream PDF embedded font (sfnt) at offset 0x91B9 5528 bytes
font_01_sfnt_off0000a477.bin
e4d1f9b186f75a1484d295e196a89a1cf2338d66c669a5ea8baae5701a981221
pdf-font-stream PDF embedded font (sfnt) at offset 0xA477 10384 bytes