Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fc90292935beb67…

MALICIOUS

PDF

46.4 KB Created: 2020-08-10 18:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aaf0e12bb18806d9338d29e28563b7f6 SHA-1: 7e5e6a96c9537aba3770b7354f1ea5d014eb8b71 SHA-256: 1fc90292935beb677b8a01a29c0e365ff8ec844962be603ed00c3d70146b73fa
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, masquerading as a document about 'aseptic technique nursing'. The primary link, https://ttraff.ru/pify?keyword=aseptic+technique+nursing+pdf, is identified as a malicious redirector. The document structure and the high number of external links suggest a link farm or SEO poisoning tactic to drive traffic to malicious infrastructure. No scripts were extracted, and the document body is heavily obfuscated.

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=aseptic+technique+nursing+pdf
    • http://files.advanceddentalimplantstudies.com/uploads/1/3/1/1/131164479/75457db2ac3a2e.pdf
    • http://fulix.pokingdeadthings.com/uploads/1/3/1/1/131164250/vazuzi.pdf
    • http://files.bricecjones.com/uploads/1/3/1/0/131070518/minifesoxuvosekar.pdf
    • http://files.music-in-hospitality.com/uploads/1/3/1/4/131437619/964aee3b.pdf
    • http://pitiwovow.ipadbootcampforteachers.com/uploads/1/3/2/6/132681556/852259.pdf
    • https://cdn.shopify.com/s/files/1/0435/7485/3793/files/lilufir.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5314/files/sklearn_confusion_matrix.pdf
    • https://cdn.shopify.com/s/files/1/0428/9177/2063/files/93462720192.pdf
    • https://cdn.shopify.com/s/files/1/0433/1808/3742/files/8267188059.pdf
    • https://cdn.shopify.com/s/files/1/0427/9848/1564/files/kumegojunizefavani.pdf
    • https://cdn.shopify.com/s/files/1/0430/5004/1495/files/reading_comprehension_activities.pdf
    • https://cdn.shopify.com/s/files/1/0432/7650/1147/files/zuselelor.pdf
    • https://cdn.shopify.com/s/files/1/0434/8890/3325/files/wuboguwipujosimavekelakir.pdf
    • https://cdn.shopify.com/s/files/1/0430/4440/5397/files/ranubavomafala.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_off000074bb.bin
5c5365cf6ceb090c52f95a6830330f0b5f8b88e7bb4aca097208841d90c9b46f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74BB 5288 bytes
font_01_sfnt_off000086a3.bin
cd5b80d4d769328d898c97831bd49b112b9d30ec0b68e9490438fa66572c3db5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86A3 10876 bytes

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