Malicious PDF — malware analysis report

Static analysis result for SHA-256 16081d1a9f0860d1…

MALICIOUS

PDF

64.4 KB Created: 2020-08-30 01:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f26e3d4f31cd8f12d4259f5a79f47dc SHA-1: 750f357ef76030b50c554ae857aad3234e83b28e SHA-256: 16081d1a9f0860d1cf7fb9d91dcba159e60459c5d08ab77a78e987d7475cb7ce
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link that redirects to a known malicious domain, disguised with a job application lure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this behavior. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm or spamming operation. No scripts were extracted, but the embedded URL is the primary indicator of malicious activity.

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.com/wix?keyword=job+application+letter+format+in+kannada
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_c60a33eac6584991969a75197cdb0190.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_ada6460ff2c4439591acfd443403ba0d.pdf
    • https://static.usrfiles.com/ugd/6116da_33e1084e5ff8432f88338ad085a05a73.pdf
    • https://static.usrfiles.com/ugd/b8c837_a72986893ff84307bfb04e19a1cf9941.pdf
    • https://cdn.shopify.com/s/files/1/0434/0659/0106/files/96807400230.pdf
    • https://cdn.shopify.com/s/files/1/0433/1785/4373/files/cvc_word_family_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0429/9338/5633/files/21302963593.pdf
    • https://cdn.shopify.com/s/files/1/0430/6763/7917/files/32659130507.pdf
    • https://static.usrfiles.com/ugd/c0b427_b44310c770924172b3b1bdc31f47a9c5.pdf
    • https://static.usrfiles.com/ugd/0789d5_7358c6287218453c97a6b233c052931c.pdf
    • https://static.usrfiles.com/ugd/b8c837_99ad1b897190417794d4720556388221.pdf
    • https://static.usrfiles.com/ugd/bae363_686773290ad74dde83df4532cd26033d.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f35e69666394c26ba122993f94d4a6d.pdf
    • https://cdn.shopify.com/s/files/1/0432/9373/7118/files/belt_conveyor_operation_manual.pdf
    • https://cdn.shopify.com/s/files/1/0444/3540/7014/files/coefficient_of_correlation.pdf
    • https://cdn.shopify.com/s/files/1/0462/0088/1315/files/guidelines_pneumonia_american_thoracic_society.pdf
    • https://cdn.shopify.com/s/files/1/0431/2114/8061/files/tamikap.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000b8a7.bin
e91b6f7c26fdf850ddb1f91a03e6807be27772a8744b4020d4a80cddbd993da7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB8A7 4268 bytes
font_00_sfnt_off00009cb9.bin
a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CB9 2828 bytes
font_01_sfnt_off0000a6b3.bin
d4f39100b256c660c15222eacf2c4af958bbbfded95f671178309cdd47e3b665		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6B3 5316 bytes
font_03_sfnt_off0000c7f5.bin
1e4d90242ec558e1b8647552d25499b0c81f225df3a9c7d6ff9e5da6187f2bbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F5 13160 bytes

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