Malicious PDF — malware analysis report

Static analysis result for SHA-256 eec8ea95cedf8aac…

MALICIOUS

PDF

40.6 KB Created: 2020-08-08 01:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0035679924d5d5f2f904ad275ec80927 SHA-1: 2f04cc8f721cd31b6f69167cf500c123b9fa4c57 SHA-256: eec8ea95cedf8aacac3aa6a658211f57981121ea67dda82d3cb23d735fbe9a27
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing a malicious redirector link and a large link farm. The primary malicious URL identified is https://ttraff.ru/pify?keyword=acetabular+fracture+rehabilitation+exercises+filetype+pdf. The document body contains garbled text but also repeats the malicious URL, suggesting it is part of the lure. The presence of numerous embedded links, many pointing to external PDFs, indicates a likely attempt to distribute malicious content or conduct phishing.

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=acetabular+fracture+rehabilitation+exercises+filetype+pdf
    • http://files.nobbysyoga.com/uploads/1/3/0/7/130739032/zuzaruzoda.pdf
    • http://files.bernerayhistorical.com/uploads/1/3/1/8/131871674/2409551.pdf
    • http://files.alliumresearch.com/uploads/1/3/1/4/131453401/gabiliwizebo-doximadeton-timirodexatezab-fuziworapobadut.pdf
    • https://cdn.shopify.com/s/files/1/0431/9900/4831/files/kavujapekede.pdf
    • https://cdn.shopify.com/s/files/1/0440/2964/0854/files/cutting_edge_third_edition_pre_intermediate_student_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/9282/8579/files/19080714560.pdf
    • https://cdn.shopify.com/s/files/1/0428/2934/9030/files/19110131333.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7701/files/73716137438.pdf
    • https://cdn.shopify.com/s/files/1/0429/3863/0300/files/metal_gear_solid_5_direct_contract.pdf
    • https://cdn.shopify.com/s/files/1/0430/8795/4073/files/61875834692.pdf
    • https://cdn.shopify.com/s/files/1/0429/7061/1871/files/speaking_exercises_for_english_learners.pdf
    • https://cdn.shopify.com/s/files/1/0429/7375/7603/files/suduxiwexeb.pdf
    • https://cdn.shopify.com/s/files/1/0433/5314/5495/files/futam.pdf
    • https://cdn.shopify.com/s/files/1/0434/9765/2376/files/daedalus_and_icarus_story.pdf
    • https://cdn.shopify.com/s/files/1/0433/6176/3480/files/65131139237.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_off000061df.bin
e3614b873d3ab859f6f7e93a8f45edcf95763074947354b22b13423b625c6cca
pdf-font-stream PDF embedded font (sfnt) at offset 0x61DF 5544 bytes
font_01_sfnt_off000074b3.bin
c1ca4776f8a5c1a1936b8e450d73872dc43a71633d17e6447c3f7614415335e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x74B3 9524 bytes