Malicious PDF — malware analysis report

Static analysis result for SHA-256 31157b89e1a36de1…

MALICIOUS

PDF

41.4 KB Created: 2020-08-08 18:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac6a734b4e063303a5eacb86f598c33a SHA-1: b981281b762d004ab79b43ab5e6dd7478b5c82fe SHA-256: 31157b89e1a36de1af55469f57fd5126d54f3606c6c91377ef9603efc5ac75b6
150 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is https://ttraff.com/pify?keyword=sociocultural+anthropology+pdf. The document body, though heavily obfuscated, also contains this URL, suggesting it is the intended lure. The presence of numerous other links to potentially compromised Shopify domains and other unknown domains indicates a link farm strategy to obscure the final malicious destination.

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=sociocultural+anthropology+pdf
    • http://jepokojij.avonshairandbeauty.com/uploads/1/3/1/6/131637136/5427308.pdf
    • http://files.restorationlogcabinrentals.com/uploads/1/3/1/3/131380063/d33c339.pdf
    • http://files.autismispants.com/uploads/1/3/0/7/130776499/4fb32fc.pdf
    • http://files.nwarkansashomeguide.com/uploads/1/3/1/4/131438439/kakevolelaxu-gopakupijazeju.pdf
    • http://files.cathyherndon.com/uploads/1/3/1/4/131406412/4200945.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/semigo.pdf
    • https://cdn.shopify.com/s/files/1/0438/0524/5597/files/59549121672.pdf
    • https://cdn.shopify.com/s/files/1/0434/8762/5369/files/fundamentals_of_engineering_thermodynamics.pdf
    • https://cdn.shopify.com/s/files/1/0429/7592/0282/files/42533879428.pdf
    • https://cdn.shopify.com/s/files/1/0433/5897/8207/files/24018548183.pdf
    • https://cdn.shopify.com/s/files/1/0437/9151/5805/files/centrifugal_chiller_operation.pdf
    • https://cdn.shopify.com/s/files/1/0431/2806/2109/files/xawaradevemib.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0210/files/dclaration_trimestrielle_auto_entrepreneur_urssaf.pdf
    • https://cdn.shopify.com/s/files/1/0437/7713/0647/files/panduan_belajar_mandiri_bahasa_korea.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9510/files/42403050301.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_off00006226.bin
192de281141901e6e042e78a19b03373b759f8ceaaa334c84e5a335577da9b63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6226 5444 bytes
font_01_sfnt_off000074b0.bin
709235c2f2a213c5f57bba6dd223fe98d9148091ec3e354be04ff5a8e7fb2e10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74B0 10668 bytes

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