Malicious PDF — malware analysis report

Static analysis result for SHA-256 c276ce7ebc5c707f…

MALICIOUS

PDF

45.5 KB Created: 2020-08-06 09:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 017009a5beb7a6abfbf5efd65f8e9be9 SHA-1: 7ff74a5dd76374826d6ef20b5115dcd9d9becdd7 SHA-256: c276ce7ebc5c707f7987a77c562b31feba90d9aeb57d279785e0c4fc167aa634
150 Risk Score

Malware Insights

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

The PDF contains a high number of external links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that triggers the malicious redirect. The presence of numerous links suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier also strongly indicated maliciousness.

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=how+to+build+a+biogas+digester+pdf
    • http://files.nathanrichardsonactor.com/uploads/1/3/0/7/130739268/jenosotezezesuzuf.pdf
    • http://files.sharonvigil.com/uploads/1/3/0/7/130738785/murope.pdf
    • http://files.mind4age.com/uploads/1/3/0/7/130776265/669021.pdf
    • https://cdn.shopify.com/s/files/1/0430/7002/9975/files/mp4_to_amv.pdf
    • https://cdn.shopify.com/s/files/1/0435/6577/7059/files/is_iexplorer_safe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kepikopu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9033/7189/files/pitosolipexopijiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/8613/5961/files/ampicilina_500_bula.pdf
    • https://cdn.shopify.com/s/files/1/0432/6467/1909/files/zozisenofutenukiduvuruxev.pdf
    • https://cdn.shopify.com/s/files/1/0432/0290/4222/files/44326723046.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0933/files/49403744228.pdf
    • https://cdn.shopify.com/s/files/1/0433/4655/9127/files/a_pocket_guide_to_public_speaking.pdf
    • https://cdn.shopify.com/s/files/1/0430/7140/6237/files/bitsat_syllabus_weightage.pdf
    • https://cdn.shopify.com/s/files/1/0437/2863/4010/files/kivoxexef.pdf
    • https://cdn.shopify.com/s/files/1/0433/3161/6923/files/ethnography_and_ethnology.pdf
    • https://cdn.shopify.com/s/files/1/0439/0407/3883/files/79462279248.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_off00007259.bin
aed268b089879d8ead78ebad572e125af2a6ba2310652258ab20d999cc5374a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7259 5404 bytes
font_01_sfnt_off000084cf.bin
51564716044126ff53ec25ae163e659d58f689354cf6d7053e775590365f7973		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84CF 10448 bytes

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