Malicious PDF — malware analysis report

Static analysis result for SHA-256 d666dfd158f25c01…

MALICIOUS

PDF

44.3 KB Created: 2020-08-18 15:40:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3c2b5aa90603d80a7bbbaa50724805c SHA-1: 2619943f267fffda0fbf7897f90f57b12fd7f845 SHA-256: d666dfd158f25c01cf3771f794980f6ee2d58e0dd2db2645fe9ee20c7c99aa4c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, forming a link farm. One of the primary links, 'https://ttraff.ru/pify?keyword=english+grammar+lessons+pdf+free', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to lure users to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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.ru/pify?keyword=english+grammar+lessons+pdf+free
    • http://files.classroomacademy.org/uploads/1/3/1/4/131438324/rexedabobeda.pdf
    • http://files.emilypassman.com/uploads/1/3/0/8/130873851/woliwimomile-jajifik-ketotawe-nijapa.pdf
    • http://files.sophisticatedpress.com/uploads/1/3/1/4/131437276/788758.pdf
    • http://files.whitebeamphotography.com/uploads/1/3/1/4/131408581/zumerawunovafoxa.pdf
    • http://files.allykeast.com/uploads/1/3/0/7/130775653/kukebobegavudu_lanekog.pdf
    • https://cdn.shopify.com/s/files/1/0439/9045/0334/files/multilingualism_advantages_and_disadvantages.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/bavedatujorisuwafesoba.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/bliss_point_economics_optional_notes.pdf
    • https://cdn.shopify.com/s/files/1/0430/6688/4250/files/23754989009.pdf
    • https://cdn.shopify.com/s/files/1/0433/4357/7246/files/antisocial_behavior_questionnaire.pdf
    • https://cdn.shopify.com/s/files/1/0429/8624/2209/files/pupunuzawabiretelarewapo.pdf
    • https://cdn.shopify.com/s/files/1/0436/2086/0064/files/zuladekosemutasafe.pdf
    • https://cdn.shopify.com/s/files/1/0439/0905/4619/files/depaginunipo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9661/2768/files/digajiriranazogomuxezomis.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7342/files/niwinesal.pdf
    • https://cdn.shopify.com/s/files/1/0447/9251/2678/files/leon_battista_alberti_de_re_aedificatoria.pdf
    • https://cdn.shopify.com/s/files/1/0436/3550/7358/files/3066157093.pdf
    • https://cdn.shopify.com/s/files/1/0434/1248/8343/files/bodyweight_fitness_program.pdf
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/gamikepogibemalewoju.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000600b.bin
67a2413d5099bff443fb1bde8ab27b19c0e8c827835301228e43028882fe4eae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x600B 5120 bytes
font_01_sfnt_off00007136.bin
450eb2da0af9c1ec11f075baa4e988320e402d9c019831e43d154d1a5100df52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7136 10736 bytes
font_02_sfnt_off000095c3.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95C3 4324 bytes

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