Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3db7bf541da22ae…

MALICIOUS

PDF

41.2 KB Created: 2020-08-20 19:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4d4a7110580a57cae6a518a7ecb31b4 SHA-1: 6f538fca63adc0b618341ffa11f55908d6d94cd0 SHA-256: a3db7bf541da22ae02e6400021fb4614d0c7dfcf4cc5f66e683efabd86fec71a
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a significant number of embedded links. One of these links, https://ttraff.ru/pify?keyword=canarios+gaspar+sanz+pdf, points to known malicious redirector infrastructure. The presence of a large link farm, with many links pointing to benign-looking Shopify URLs, suggests a tactic to obscure the malicious destination or to leverage SEO for distribution. 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.ru/pify?keyword=canarios+gaspar+sanz+pdf
    • http://files.wisconsinsportsturf.com/uploads/1/3/0/7/130738751/mitutenapamu-vemor-jixoja-geluteg.pdf
    • http://zurukewaf.allisonmoody.net/uploads/1/3/0/8/130874153/pupam.pdf
    • https://cdn.shopify.com/s/files/1/0435/3340/2266/files/mitevovezipexapusarupasud.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/kemofemujuzalunivexuj.pdf
    • https://cdn.shopify.com/s/files/1/0437/2643/8550/files/tenemodadulobivek.pdf
    • https://cdn.shopify.com/s/files/1/0438/3975/0294/files/vifilapebupolutijami.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/deberikiroxovin.pdf
    • https://cdn.shopify.com/s/files/1/0430/8231/7975/files/harvard_citation_generator.pdf
    • https://cdn.shopify.com/s/files/1/0431/5430/9280/files/juxoko.pdf
    • https://cdn.shopify.com/s/files/1/0434/4116/0344/files/ayat_ruqyah_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/7679/7081/files/jixofeduzegefijana.pdf
    • https://cdn.shopify.com/s/files/1/0427/4782/2236/files/93418378493.pdf
    • https://cdn.shopify.com/s/files/1/0431/8697/8984/files/januwiw.pdf
    • https://cdn.shopify.com/s/files/1/0435/2396/5080/files/alternative_dispute_resolution_act_ghana.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_off000064ad.bin
438b30c762070af23deac0652a8f5f2ec61ddc2362b1d1ab8a49193028023889
pdf-font-stream PDF embedded font (sfnt) at offset 0x64AD 5132 bytes
font_01_sfnt_off00007638.bin
dfd03872420a5bc2cebd727dc03520237e0f76e3cb5f62d7e5772816a409dc08
pdf-font-stream PDF embedded font (sfnt) at offset 0x7638 9976 bytes