Malicious PDF — malware analysis report

Static analysis result for SHA-256 38bb51cb813cf538…

MALICIOUS

PDF

49.9 KB Created: 2020-08-08 23:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15b7bc1d44966280134a42f6bb6f1a6d SHA-1: 7e66a259b3b77402ea9712a1241a8860699cc30e SHA-256: 38bb51cb813cf538f64424e254585ddb6d22095f6079736935e090ccd1dc6b28
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including a critical redirector to 'ttraff.com' which is associated with malicious activity. The document body, though heavily obfuscated, contains text suggesting a lure for 'autobiography pdf free', indicating a likely attempt to trick users into clicking malicious links. The ML classifier also 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=autobiography+pdf+free
    • http://files.icmarlboro.org/uploads/1/3/2/6/132681308/xiganevasokuna.pdf
    • http://files.attitude4acting.com/uploads/1/3/1/4/131438282/5600802.pdf
    • http://files.discoverycdtech.com/uploads/1/3/1/8/131871992/f2b4e60cce3.pdf
    • http://legajosi.michigandancecompany.com/uploads/1/3/0/8/130814297/429311d00.pdf
    • https://cdn.shopify.com/s/files/1/0430/5436/6877/files/rejosegivagi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9080/files/44079436028.pdf
    • https://cdn.shopify.com/s/files/1/0434/1917/3029/files/momifilirixinomegupaki.pdf
    • https://cdn.shopify.com/s/files/1/0428/6355/8815/files/22085462057.pdf
    • https://cdn.shopify.com/s/files/1/0431/5283/4711/files/xipilawejunikubegot.pdf
    • https://cdn.shopify.com/s/files/1/0433/8103/1061/files/7693582248.pdf
    • https://cdn.shopify.com/s/files/1/0434/9722/6402/files/xamoxejatefexofonufotitej.pdf
    • https://cdn.shopify.com/s/files/1/0431/7573/9560/files/47041823681.pdf
    • https://cdn.shopify.com/s/files/1/0431/8789/6488/files/wasodazuru.pdf
    • https://cdn.shopify.com/s/files/1/0427/7737/8972/files/18824175491.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72593533024.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/24375498268.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_off00008549.bin
e99613a93e157a8d5cad35de2891f37d80b8e00747a6ac5c6d4205cf39b4f21b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8549 5324 bytes
font_01_sfnt_off00009769.bin
ec7b76f369b4b3dc15b171631eb4912f4341003e5d2ac8b46e4b4ea8f32a8d09
pdf-font-stream PDF embedded font (sfnt) at offset 0x9769 10392 bytes