Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4f10e26ebd21ec…

MALICIOUS

PDF

53.8 KB Created: 2020-08-20 18:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbcaf027b8e6dbc0df94d80c7d66c0b4 SHA-1: 69b913c49acc529ec426acd0a82842bce4e53f26 SHA-256: 8c4f10e26ebd21ec6af59ff7bf6a990f1cd75c9c5442bad7be630b7012710a98
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=private+guided+tours+of+ireland'. Another critical heuristic identified a PDF link farm, with the first URL being 'https://cdn.shopify.com/s/files/1/0430/4686/3005/files/32038991329.pdf'. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL, suggesting the primary intent is to direct users to malicious content.

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.cc/pify?keyword=private+guided+tours+of+ireland
    • http://guzuteseg.mrromswinckel.com/uploads/1/3/1/8/131856935/nexabozabuj.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/32038991329.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/muxolalinurijelibabozafod.pdf
    • https://cdn.shopify.com/s/files/1/0430/8896/9882/files/biliary_excretion.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8074/files/lusubozodisiju.pdf
    • https://cdn.shopify.com/s/files/1/0433/4256/1445/files/beef_cookbook.pdf
    • https://cdn.shopify.com/s/files/1/0435/0659/8040/files/kolat.pdf
    • https://cdn.shopify.com/s/files/1/0431/2432/6566/files/82825108710.pdf
    • https://cdn.shopify.com/s/files/1/0438/3657/1805/files/top_biography_books.pdf
    • https://cdn.shopify.com/s/files/1/0435/5594/6647/files/centuries_of_childhood.pdf
    • https://cdn.shopify.com/s/files/1/0440/8786/9592/files/62761481142.pdf
    • https://cdn.shopify.com/s/files/1/0440/1247/0422/files/passport_size_photo_a4_sheet.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_off0000939b.bin
1bc545f8e4ee71a72e2e979f029b6178922c76c13c0466b4f620804dce4a69a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x939B 5136 bytes
font_01_sfnt_off0000a527.bin
922fe445b31e0777323ce05f3e5404cf43076c8f04786f2b7daf461e0f34dce0
pdf-font-stream PDF embedded font (sfnt) at offset 0xA527 10828 bytes