Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c49ecc4dc13804…

MALICIOUS

PDF

41.2 KB Created: 2020-09-20 09:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b810510e5df5046d3ae170366880416c SHA-1: 9deddedd4468b956ad55a2d255aca1d3c635c18d SHA-256: 37c49ecc4dc13804e0440551a53b782509f30c25024129d6fed8c0ae6c3787db
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, many of which point to suspicious domains and are likely part of a link farm designed to improve search engine rankings for malicious content. One critical heuristic identified a link to a known malicious redirector, https://ttraff.me/wix?keyword=solutions+worksheet+%25231+answer+key, which is the primary indicator of malicious intent. The document body, though heavily obfuscated, contains text fragments that suggest it is masquerading as a worksheet answer key to entice users to click the malicious links.

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.me/wix?keyword=solutions+worksheet+%25231+answer+key
    • http://files.sudassociates.com/uploads/1/3/0/9/130969705/3c77261c1bce.pdf
    • http://rakurife.loraincountyohc.net/uploads/1/3/1/4/131453177/woxepizi.pdf
    • http://files.fashionandfreckles.com/uploads/1/3/2/8/132814050/lerexi.pdf
    • http://tasaxatof.morganmckeen.com/uploads/1/3/0/7/130740189/ximujeroku.pdf
    • http://files.897788976207812023.com/uploads/1/3/1/6/131606733/xerotan_wosofazanotovo_dapomisi_gegawovaj.pdf
    • http://lasod.evergreencookiecompany.com/uploads/1/3/0/7/130776088/woragerugizefaka.pdf
    • http://files.andrew-bailes.com/uploads/1/3/0/8/130874566/3126161.pdf
    • https://cdn.shopify.com/s/files/1/0432/9363/8822/files/carboxiterapia_flacidez.pdf
    • https://cdn.shopify.com/s/files/1/0429/6055/2085/files/beko_washing_machine_10kg_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7868051279.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_off000064a1.bin
35c9e1d92a7d06bf065dac32ac494ccee6bdd6c4182ccbe6d7f91310c28a849b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64A1 4824 bytes
font_01_sfnt_off00007513.bin
cef81d3ac3e736c503cad6850eafda996454e3458c8178e67d3882160e3e2a79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7513 10428 bytes

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