Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c65c6dc573df3f6…

MALICIOUS

PDF

36.9 KB Created: 2020-08-14 04:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e986a0119bc571f9d429c2fa6099bd89 SHA-1: 71f101a3471cbc514ea423dc5a87229110a13be4 SHA-256: 8c65c6dc573df3f6e64923de28b957d65021b6dbd461e3e4afa777f641801caa
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a sale advertisement. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=kickee+crib+sheet+sale' which is flagged as malicious. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded links pointing to external resources, many of which are hosted on Shopify. The ML classifier strongly indicates 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.ru/pify?keyword=kickee+crib+sheet+sale
    • http://files.pcaspiritstore.com/uploads/1/3/1/6/131637147/funuzonowavimuz-woxuledeviw-terevefobok.pdf
    • http://files.bvwthespot.com/uploads/1/3/1/4/131438018/35b637d94733.pdf
    • http://guziloliv.flareperformance.com/uploads/1/3/1/4/131483281/5863626.pdf
    • https://cdn.shopify.com/s/files/1/0430/8025/3593/files/72641524897.pdf
    • https://cdn.shopify.com/s/files/1/0431/5404/7137/files/medium_carbon_steel_properties_and_uses.pdf
    • https://cdn.shopify.com/s/files/1/0437/9947/8434/files/tumblr_mass_post_editor.pdf
    • https://cdn.shopify.com/s/files/1/0430/4768/2201/files/bouwbesluit_praktijk.pdf
    • https://cdn.shopify.com/s/files/1/0434/3732/6488/files/notazisivazuriwujajesi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5470/2496/files/51627133404.pdf
    • https://cdn.shopify.com/s/files/1/0435/1698/5503/files/blackberry_android_9_pie.pdf
    • https://cdn.shopify.com/s/files/1/0432/6267/3054/files/27281413554.pdf
    • https://cdn.shopify.com/s/files/1/0434/6321/3209/files/design_trends_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/7956/5465/files/96017772129.pdf
    • https://cdn.shopify.com/s/files/1/0429/5573/5203/files/59683779568.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/parliament_reporter_vacancy_2019.pdf
    • https://cdn.shopify.com/s/files/1/0437/1621/4936/files/autotable_jspdf_options.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_off000053b0.bin
d551a564021aecece01e42e159f9df84ab8c646398c2a792b87f0046f88e42dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x53B0 5060 bytes
font_01_sfnt_off000064d2.bin
3fe44febea514bf9cbea1f22e9d7ef61797d3f86310a16619ed66942971b1982
pdf-font-stream PDF embedded font (sfnt) at offset 0x64D2 9936 bytes