Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a90b54cd49eb4b…

MALICIOUS

PDF

45.7 KB Created: 2020-10-27 17:28:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd1571c2fee76db586d08a29d4c2ee90 SHA-1: 1db5fe177d6c0ccb27b87885a67d14a2d960c480 SHA-256: 41a90b54cd49eb4b03a01fb747843e205848adecfeed88d733ab5ffee9ab2d09
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://gettraff.ru/123?keyword=uline+pallet+jack+h+1043'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, including one to 'https://cdn.shopify.com/s/files/1/0465/8787/1397/files/msl_code_sprint_apk.pdf'. The ML classifier also strongly flagged this PDF as malicious. These indicators suggest the document is designed to redirect users to potentially harmful content.

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://gettraff.ru/123?keyword=uline+pallet+jack+h+1043
    • https://cdn-cms.f-static.net/uploads/4383321/normal_5f8dfc6193840.pdf
    • https://cdn-cms.f-static.net/uploads/4366989/normal_5f897f7ad35fd.pdf
    • https://cdn-cms.f-static.net/uploads/4389582/normal_5f8f1bd9e1c40.pdf
    • https://cdn-cms.f-static.net/uploads/4410695/normal_5f9767ae9cbcd.pdf
    • https://cdn-cms.f-static.net/uploads/4379605/normal_5f8ded5510db0.pdf
    • https://cdn-cms.f-static.net/uploads/4406456/normal_5f95a6e397cb1.pdf
    • https://cdn-cms.f-static.net/uploads/4374379/normal_5f928044ecea8.pdf
    • https://cdn-cms.f-static.net/uploads/4381104/normal_5f8b744c9bdd6.pdf
    • https://cdn-cms.f-static.net/uploads/4383923/normal_5f923ce21bd28.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0465/8787/1397/files/msl_code_sprint_apk.pdf
    • https://cdn.shopify.com/s/files/1/0482/4816/0411/files/ribizupuzu.pdf
    • https://cdn.shopify.com/s/files/1/0479/9741/9679/files/lusivazisigavimi.pdf
    • https://cdn.shopify.com/s/files/1/0500/1153/7600/files/zenikokagamidelewuvoxeme.pdf
    • https://s3.amazonaws.com/ronatiduzoxij/31567150740.pdf
    • https://s3.amazonaws.com/zirojopemup/netikekekiwotabilirerope.pdf
    • https://s3.amazonaws.com/kasuwevovog/faxeripimokuxo.pdf
    • https://s3.amazonaws.com/jewizopukuni/full_bible_in_kannada.pdf
    • https://s3.amazonaws.com/gofiguj/tozedosefudo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4157/8399/files/27702514683.pdf
    • https://cdn.shopify.com/s/files/1/0484/8877/5830/files/12v_air_pump_fish.pdf
    • https://cdn.shopify.com/s/files/1/0480/7481/7693/files/bibufasotikem.pdf
    • https://cdn.shopify.com/s/files/1/0486/5533/5574/files/dibujo_tecnico_simbologia_de_soldadura.pdf
    • https://uploads.strikinglycdn.com/files/679740e2-ee24-4d1f-a0af-b8f086fe6bf3/906389280.pdf
    • https://uploads.strikinglycdn.com/files/b804e808-8a87-4c85-be95-407fece05b0e/zimazazunozusova.pdf
    • https://uploads.strikinglycdn.com/files/aea94c14-97fd-419b-9030-8d59711edef4/88977158918.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ad6.bin
fd140282534e371eeaf0b02fbe6facaa660e83ab30561065673d10242eba644f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AD6 5324 bytes
font_01_sfnt_off00006cfb.bin
0c5fd293c6d58470d95523d74df20a4706c422700741341a4209fd2c0d6f5b66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CFB 11532 bytes
font_02_sfnt_off00009472.bin
72b50ce8393e6665d617349b385eb0c2ebfa959cff1463be065fa2826278273f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9472 16076 bytes

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