Malicious PDF — malware analysis report

Static analysis result for SHA-256 14f9cebbd4c78906…

MALICIOUS

PDF

41.8 KB Created: 2020-08-16 12:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0b6eeae6114e559fbc9e80dbfed3630 SHA-1: 7ffc047ae0d7069d80d6fc6c895670f05d718beb SHA-256: 14f9cebbd4c78906d77f2aa0098999b3b68bbccd700ddca44ca7a836b10265de
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO abuse tactic. One critical heuristic identified a link to a known malicious redirector, 'ttraff.cc', which is used to obscure the final malicious destination. The document body, though heavily obfuscated, contains text related to physics answers and the malicious URL, reinforcing the lure.

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=friction+lab+physics+answers
    • http://fapig.customerservicetalk.com/uploads/1/3/1/8/131857631/duwazavarinemos.pdf
    • http://files.lampnyc.org/uploads/1/3/0/7/130738883/nuteluletawi-rozuv-zabojezir-tirarepodod.pdf
    • http://pevib.tenshelpingtens.com/uploads/1/3/0/7/130739573/kaxaguzopoke.pdf
    • http://files.jamesazarzana.com/uploads/1/3/2/3/132303001/rudekasizexuguse.pdf
    • http://files.buttonsupjewelry.com/uploads/1/3/0/9/130969772/warezewetororema.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/7682/0890/files/rivekasolodaxetodoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/3989/1357/files/zojen.pdf
    • https://cdn.shopify.com/s/files/1/0434/0560/7079/files/gunojivugabuxega.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mizamolapo.pdf
    • https://cdn.shopify.com/s/files/1/0435/9431/7981/files/kolinowapegasu.pdf
    • https://cdn.shopify.com/s/files/1/0436/0280/4898/files/albizia_procera.pdf
    • https://cdn.shopify.com/s/files/1/0430/8349/7621/files/fupanipumodokixa.pdf
    • https://cdn.shopify.com/s/files/1/0429/1110/5191/files/32797770367.pdf
    • https://cdn.shopify.com/s/files/1/0428/9367/2604/files/mariah_carey_hero_music.pdf
    • https://cdn.shopify.com/s/files/1/0433/1021/9432/files/zawem.pdf
    • https://cdn.shopify.com/s/files/1/0438/6498/1664/files/mmrc_dyspnea_scale.pdf
    • https://cdn.shopify.com/s/files/1/0429/9007/6067/files/muzetukox.pdf
    • https://cdn.shopify.com/s/files/1/0436/1139/0115/files/taduwudipawujefurefivevek.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059b1.bin
d4ce525d1a005a3fbe4178d2e5b4cc5f316dd4841d78fa17ff7023e3e09838fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59B1 5100 bytes
font_01_sfnt_off00006afb.bin
1c404e733081cf83a013e94acb57073f61056df50d67516a6a5ebfa9c1229253		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AFB 9728 bytes
font_02_sfnt_off00008c34.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C34 4324 bytes

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