Malicious PDF — malware analysis report

Static analysis result for SHA-256 2da5f8e6e6c5a8e9…

MALICIOUS

PDF

62.3 KB Created: 2020-08-12 23:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4126c273582c7eeeaa4b70be59c1549 SHA-1: 9e6d16c86e8c8bb54cff6e98f613fbdcd71b3936 SHA-256: 2da5f8e6e6c5a8e97241d5cf4dc32612b1cf38b0416bc5db810c62b7f861b28e
150 Risk Score

Malware Insights

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

The PDF document contains a malicious redirector link disguised as a 'Biblical hebrew dictionary pdf'. This link leads to a large collection of other PDFs hosted on Shopify, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness, and the PDF structure is consistent with known malicious redirector techniques.

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.com/pify?keyword=biblical+hebrew+dictionary+pdf
    • http://files.shannonlegrand.com/uploads/1/3/1/4/131407357/7080044.pdf
    • http://dubofajab.careerconstructioninstitute.org/uploads/1/3/0/7/130776483/dac926a6ecf.pdf
    • http://rejojat.rayssites.com/uploads/1/3/1/1/131163658/nutozuzudurele.pdf
    • https://cdn.shopify.com/s/files/1/0429/0645/2131/files/tomixitukizowufifid.pdf
    • https://cdn.shopify.com/s/files/1/0434/2064/7576/files/66004066923.pdf
    • https://cdn.shopify.com/s/files/1/0433/9000/9502/files/the_articles_in_english_grammar.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65233410578.pdf
    • https://cdn.shopify.com/s/files/1/0433/8394/7414/files/cancer_de_intestino_grosso.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1293/files/ligifudi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9564/5589/files/23860205824.pdf
    • https://cdn.shopify.com/s/files/1/0438/4591/0678/files/problem_solving_strategies_problem_books_in_mathematics.pdf
    • https://cdn.shopify.com/s/files/1/0434/9257/3334/files/45112693865.pdf
    • https://cdn.shopify.com/s/files/1/0431/0643/5232/files/jimelifuxafesisafewenape.pdf
    • https://cdn.shopify.com/s/files/1/0431/9051/7911/files/bagegatawotivur.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/33374625424.pdf
    • https://cdn.shopify.com/s/files/1/0435/7872/0414/files/20354151046.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mowelikuzamutaj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000cea7.bin
693f15eccb4a4379eeeb81978c974e9959d8b06d3c0e19885fd398d91913daf7
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCEA7 18500 bytes
font_00_sfnt_off00008fdd.bin
745ad2f098284efcac8fad8cd787c1aff9a1e2128c64ab5af22863b45c514ddb
pdf-font-stream PDF embedded font (sfnt) at offset 0x8FDD 5448 bytes
font_01_sfnt_off0000a265.bin
70660a9441eba8bf5db0bb6b0b6b15147fda8cc6a3b9b95a67f6c5ff482b5ab4
pdf-font-stream PDF embedded font (sfnt) at offset 0xA265 13608 bytes