Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a56535cc040448b…

MALICIOUS

PDF

36.9 KB Created: 2020-08-22 09:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d172ed4ff7645cf67883a83e186cc442 SHA-1: cd704adfa1a6bbdb8986611165f9849d30b80d96 SHA-256: 9a56535cc040448b4031ca45fd37012c0ae1bbc9b0a64b6d559a0a63d10d2a46
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, contains the same malicious URL and appears to be a lure for a free offer, likely to trick users into clicking the malicious link. The ML classifier strongly indicated maliciousness.

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=fancy+pants+3+free
    • http://files.anacasasmd.com/uploads/1/3/0/9/130969399/5787097.pdf
    • https://cdn.shopify.com/s/files/1/0450/9492/8537/files/yeezy_700_analog_size_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/8384/1190/files/pifasuruteredu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5325/9679/files/netbeans_vs_eclipse_performance.pdf
    • https://cdn.shopify.com/s/files/1/0433/9505/5777/files/zegutumufuvetubetufo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5569/3470/files/betewoxomadulurigati.pdf
    • https://cdn.shopify.com/s/files/1/0433/4367/5560/files/79836312873.pdf
    • https://cdn.shopify.com/s/files/1/0429/9862/8501/files/64672871034.pdf
    • https://cdn.shopify.com/s/files/1/0447/2215/9772/files/165_bus_schedule_nj_transit.pdf
    • https://cdn.shopify.com/s/files/1/0434/7599/2728/files/23116683459.pdf
    • https://cdn.shopify.com/s/files/1/0428/6346/0508/files/iso_31000_risk_management_framework.pdf
    • https://cdn.shopify.com/s/files/1/0435/4726/3131/files/diveku.pdf
    • https://cdn.shopify.com/s/files/1/0427/6187/9719/files/70714578704.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_off00005205.bin
a018b96c45a4fd686e15ef1a82966a3be431ad0b0a74f8292c15514a1bb85e65
pdf-font-stream PDF embedded font (sfnt) at offset 0x5205 5200 bytes
font_01_sfnt_off000063c9.bin
a3923c17dc3c8997a052e732011e9df89a326e5fe24ac7eb4d7c46758579086b
pdf-font-stream PDF embedded font (sfnt) at offset 0x63C9 10224 bytes