Malicious PDF — malware analysis report

Static analysis result for SHA-256 51c4933a57cb4cd1…

MALICIOUS

PDF

41.1 KB Created: 2020-08-07 04:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc97eaba828ea16de587909901cca23d SHA-1: 26f4dbbf7bca4f34d822da4037fe94346f4bd707 SHA-256: 51c4933a57cb4cd16e407f710ee1637bcaff4a51d56d62b2994bd260f7c6d4e9
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=anthropological+theories+upsc+pdf', which is flagged as malicious. This suggests the PDF is designed to redirect users to malicious sites, likely for phishing or malware delivery. The presence of numerous Shopify links, some confirmed benign and others unknown, indicates a link farm strategy to obscure the malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.cc/pify?keyword=anthropological+theories+upsc+pdf
    • http://files.anneoregan.com/uploads/1/3/1/3/131384136/fipinafuluralokajimo.pdf
    • http://files.yourcargirl.com/uploads/1/3/0/7/130740521/5203952.pdf
    • http://files.nordicwolfdogs.com/uploads/1/3/2/7/132740756/3828591.pdf
    • https://cdn.shopify.com/s/files/1/0435/4696/8218/files/mewakuvesevabajo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6750/6845/files/artificial_intelligence_full_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0432/2256/5032/files/precalculus_mathematics_for_calculus_6th.pdf
    • https://cdn.shopify.com/s/files/1/0432/1411/0880/files/sageboviratosora.pdf
    • https://cdn.shopify.com/s/files/1/0435/3762/9348/files/64736007670.pdf
    • http://files.tikejiri.people.ua.edu/uploads/1/3/2/6/132682862/cb8f2.pdf
    • https://cdn.shopify.com/s/files/1/0432/0352/6820/files/archeology_books.pdf
    • https://cdn.shopify.com/s/files/1/0432/7420/7387/files/43000838312.pdf
    • https://cdn.shopify.com/s/files/1/0428/4484/8295/files/toxagud.pdf
    • https://cdn.shopify.com/s/files/1/0436/0352/5794/files/behavior_modification_therapy.pdf
    • https://cdn.shopify.com/s/files/1/0440/2210/4222/files/gidaviloxiriwaxexajopadar.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lomapatigusobotatijizu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5411/1656/files/47592829086.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5018/files/23458367728.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_off0000629c.bin
84d70d50b1d111a9253c93933053ecbc1c67848aff4df0808bf182229fd698de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x629C 5408 bytes
font_01_sfnt_off000074fd.bin
fa867f9ce0f67092e9cc17ed9ca6fc3a73e5aa86e577b80b825418176a0de777		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74FD 10144 bytes

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