Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf89ade26948d0a7…

MALICIOUS

PDF

44.3 KB Created: 2020-08-12 03:41:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4ddb782d7675d153d3daff5b8c96808 SHA-1: ef914e419803201f370497e12e1cb0887a1a1f87 SHA-256: cf89ade26948d0a7e79c98da4ac11eb84b474250e1821b53852fe001a10cb7f1
150 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.ru). This suggests a link farm or SEO poisoning technique to distribute malicious content. The document body, though heavily obfuscated, contains the malicious URL and other benign-looking PDF titles, likely to improve search engine ranking and lure victims. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=tutorial+of+c+programming+pdf
    • http://zavax.perksautospa.net/uploads/1/3/2/6/132682076/b9771.pdf
    • http://files.angelocallerame.com/uploads/1/3/1/4/131453432/lidirize-xobezo-xawik-vilirakadetebir.pdf
    • http://files.discountduniya.com/uploads/1/3/1/6/131637136/wifavofokatanivo.pdf
    • http://files.amaliallombarthuesca.com/uploads/1/3/1/8/131856852/9752670.pdf
    • http://files.halcyoncenter.com/uploads/1/3/1/3/131380316/pasufowuki-nifozivatigorep-xuzedadanovaxew-xipeguxesatir.pdf
    • https://cdn.shopify.com/s/files/1/0438/9509/5464/files/wamomuvikewabogarexitita.pdf
    • https://cdn.shopify.com/s/files/1/0436/0303/4276/files/a_handbook_of_contemporary_spanish_grammar.pdf
    • https://cdn.shopify.com/s/files/1/0432/2669/3789/files/vaxosa.pdf
    • https://cdn.shopify.com/s/files/1/0432/5031/9517/files/wavezanogusuwok.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/50036278562.pdf
    • https://cdn.shopify.com/s/files/1/0448/1653/1617/files/que_es_el_amor_psicologia.pdf
    • https://cdn.shopify.com/s/files/1/0433/2745/5387/files/analog_to_digital_converter_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/2518/7491/files/51128412263.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kupenase.pdf
    • https://cdn.shopify.com/s/files/1/0430/0436/2906/files/dagivotelux.pdf
    • https://cdn.shopify.com/s/files/1/0435/4198/7479/files/58873118564.pdf
    • https://cdn.shopify.com/s/files/1/0428/7827/1641/files/gubanowatibozix.pdf
    • https://cdn.shopify.com/s/files/1/0434/1186/5751/files/virtualbox_connect_to_internet_windows_xp.pdf
    • https://cdn.shopify.com/s/files/1/0432/4281/5643/files/kelozepiniberemusa.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_off00006f10.bin
df12c803d69bf10f8d658f5cff588f159e3d348e5e1e4f0a4d298c7d4706a3b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F10 5244 bytes
font_01_sfnt_off000080ca.bin
d3eccf96c3e4047a3e7ce034f563cf863e825948500860bcd606e630997f8488
pdf-font-stream PDF embedded font (sfnt) at offset 0x80CA 10392 bytes