Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb7cedea86b1601…

MALICIOUS

PDF

55.4 KB Created: 2020-07-28 03:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08c433b0db0a21b6855697c0146ef5d2 SHA-1: 3def103b859bce2c306c19ae29d25dcadb7e5dc5 SHA-256: fbb7cedea86b16014e4f16e402e336b5b76e0a7445a38efbc6ee5c62fa0c351e
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the ttraff.ru redirector, which is likely used to funnel victims to further malicious content. The document body is heavily obfuscated and contains no readable text, making it impossible to determine a specific lure.

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.ru/pify?keyword=frostpunk+map+guide
    • http://files.gpannualconference.com/uploads/1/3/2/3/132303117/2188665.pdf
    • http://files.westsurreytennisclub.com/uploads/1/3/2/8/132815207/vopupavowoxusuf.pdf
    • http://files.mybridgefilms.com/uploads/1/3/0/8/130874110/kogaraged.pdf
    • http://files.jwshope.com/uploads/1/3/0/7/130775659/toxejer.pdf
    • http://files.sekahandbags.com/uploads/1/3/2/7/132712093/guwomivosax-babifemopad-fonowidaber.pdf
    • https://cdn.shopify.com/s/files/1/0431/7098/8196/files/90016329166.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3904/files/zuwapemavitijutufuvurumif.pdf
    • https://cdn.shopify.com/s/files/1/0432/2538/3073/files/tofupofi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12339474235.pdf
    • https://cdn.shopify.com/s/files/1/0431/5892/9570/files/38208929377.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38746106010.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rasamonuje.pdf
    • https://cdn.shopify.com/s/files/1/0439/1868/8424/files/jugilujubupije.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27621352833.pdf
    • https://cdn.shopify.com/s/files/1/0435/4726/3131/files/7111814425.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_off00009b59.bin
dc740643eb55aff0c3f63cf47d8cc64a5e8a3a80089af5f82c0da30de354046c
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B59 5148 bytes
font_01_sfnt_off0000acc7.bin
5c8a0a666b4c8c9b17b6902e51064f4841833d0293e3fff6909000996b7c5a6b
pdf-font-stream PDF embedded font (sfnt) at offset 0xACC7 10484 bytes