Malicious PDF — malware analysis report

Static analysis result for SHA-256 23bca1367bdf9103…

MALICIOUS

PDF

55.8 KB Created: 2020-08-10 22:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6900b5a11e274acebc691c4b9c81c30f SHA-1: 7084f49ecd7453f84dbd4ca3a5bbf054c7ed19ad SHA-256: 23bca1367bdf910355b0eaaa7520de6b403307afa5171a7ba47381dec469edf6
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=capitals+of+countries+in+world+pdf'. The document body, though heavily obfuscated, contains text related to country capitals and the wkhtmltopdf application, suggesting a lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy, likely to improve search engine ranking for malicious content or to obscure the ultimate destination.

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=capitals+of+countries+in+world+pdf
    • http://files.rossyoga.com/uploads/1/3/1/8/131856492/litelixoxuro-pusumuku.pdf
    • http://files.981themarcoislandfm.com/uploads/1/3/1/6/131606186/gamew.pdf
    • http://moxizabew.dannimack.com/uploads/1/3/1/8/131857920/e55e1e.pdf
    • http://files.medicalherbalistsussex.com/uploads/1/3/1/4/131483372/jutekegegezevukejulo.pdf
    • http://files.texaspoliticaljobs.com/uploads/1/3/0/8/130874115/7770518.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57148414383.pdf
    • https://cdn.shopify.com/s/files/1/0434/0134/7226/files/47363894538.pdf
    • https://cdn.shopify.com/s/files/1/0434/2874/1272/files/36780834602.pdf
    • https://cdn.shopify.com/s/files/1/0429/3797/4950/files/nekutoso.pdf
    • https://cdn.shopify.com/s/files/1/0433/0936/7461/files/pdf_file_reader_download_app.pdf
    • https://cdn.shopify.com/s/files/1/0440/7102/6853/files/ncert_capacitors.pdf
    • https://cdn.shopify.com/s/files/1/0432/2122/1533/files/12901527426.pdf
    • https://cdn.shopify.com/s/files/1/0433/9440/0414/files/runupewegam.pdf
    • https://cdn.shopify.com/s/files/1/0430/7399/4905/files/43096789783.pdf
    • https://cdn.shopify.com/s/files/1/0437/5802/6903/files/leparesugelorafosapavigap.pdf
    • https://cdn.shopify.com/s/files/1/0434/3041/2454/files/84441491802.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/kefatarejilekerol.pdf
    • https://cdn.shopify.com/s/files/1/0431/3081/4626/files/gevanunoramukodipu.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_off00009d0e.bin
3772555b29607ea97fbf6d78dae838ca31b46d823ba34c04bd664467f414fb4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D0E 5148 bytes
font_01_sfnt_off0000aeac.bin
35299bdea553e12b5c2da4d913725787aab33c60d156e797d9ff39d5217c4da0
pdf-font-stream PDF embedded font (sfnt) at offset 0xAEAC 10276 bytes