Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a58263e70a7ae6…

MALICIOUS

PDF

43.3 KB Created: 2020-08-18 19:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db343bc07e91635ae9a2e8238a9c0b4d SHA-1: ee54309dc11b533dfe8cf7784507530655cb5196 SHA-256: a6a58263e70a7ae6fcdfc848048905aec20ec82d4c95dc7f023afe1be4ef8477
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass of external links, including a redirector to a known malicious domain, ttraff.com. The document body, though heavily obfuscated, contains text related to 'balance sheet example australia' and the URL https://ttraff.com/pify?keyword=balance+sheet+example+australia, suggesting a lure for phishing or malware distribution. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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=balance+sheet+example+australia
    • http://files.customhighlightvideos.com/uploads/1/3/1/3/131384424/lamodalovuziv.pdf
    • http://files.biancasams.com/uploads/1/3/1/6/131636642/4638240.pdf
    • http://files.shannancalcutt.com/uploads/1/3/1/4/131437775/kikasinuwazikimij.pdf
    • https://cdn.shopify.com/s/files/1/0430/3824/5017/files/67174033727.pdf
    • https://cdn.shopify.com/s/files/1/0432/9612/9192/files/blood_and_guts_a_short_history_of_medicine.pdf
    • https://cdn.shopify.com/s/files/1/0430/7959/8229/files/30472092433.pdf
    • https://cdn.shopify.com/s/files/1/0431/8488/1824/files/9491619933.pdf
    • https://cdn.shopify.com/s/files/1/0431/8163/7794/files/174587755.pdf
    • https://cdn.shopify.com/s/files/1/0428/6044/5855/files/30204077527.pdf
    • https://cdn.shopify.com/s/files/1/0432/3953/8851/files/vutafumufigo.pdf
    • https://cdn.shopify.com/s/files/1/0447/4054/2620/files/98200817763.pdf
    • https://cdn.shopify.com/s/files/1/0430/3051/1779/files/83832930060.pdf
    • https://cdn.shopify.com/s/files/1/0432/8020/3944/files/tubiduzibalumegama.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e69.bin
e778993c5add481bedf526c5814fb2819f8e2108ea79ee4388a07e7c8d8bee3a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E69 5060 bytes
font_01_sfnt_off00006f66.bin
f864bc762a0662798a3c6277e9d7e979ded8ab075bbc9265a9c241d780bc7e56
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F66 10180 bytes
font_02_sfnt_off00009230.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9230 4324 bytes