Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf568cdbdfdc3114…

MALICIOUS

PDF

37.8 KB Created: 2020-08-08 16:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d85df277b6cd1905d480a000301f53a SHA-1: 4425bc3b73450d2adef0b66eccac391eba52c8a9 SHA-256: bf568cdbdfdc31149d623b705606b81bf7b43db9b6981d795c23439933429a67
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many pointing to external PDF files hosted on various domains, including a suspicious redirector. The ML classifier strongly indicated maliciousness. The presence of a redirector URL and a large link farm suggests an attempt to either distribute further malicious content or engage in SEO manipulation for malicious purposes.

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/pify?keyword=arist%25C3%25B3fanes+livros+pdf
    • http://files.hrbi.online/uploads/1/3/1/3/131379118/204374.pdf
    • http://files.raynagill.com/uploads/1/3/1/1/131164236/fovididi_fidud_pogeperibi.pdf
    • http://files.eng.tarpanpartners.com/uploads/1/3/0/9/130969545/955353.pdf
    • http://files.stroudwomensrefuge.org/uploads/1/3/0/7/130739084/jutuxazekamupogoga.pdf
    • http://files.beauceronsleboulanger.com/uploads/1/3/1/4/131406403/6134927.pdf
    • https://cdn.shopify.com/s/files/1/0437/5448/7957/files/54449918001.pdf
    • https://cdn.shopify.com/s/files/1/0432/1935/3757/files/fapulasojibalisumow.pdf
    • https://cdn.shopify.com/s/files/1/0429/8211/3433/files/53324382583.pdf
    • https://cdn.shopify.com/s/files/1/0432/9986/4734/files/ridofomaxisogirutemajired.pdf
    • https://cdn.shopify.com/s/files/1/0430/6678/5949/files/86919055525.pdf
    • https://cdn.shopify.com/s/files/1/0432/3429/5966/files/jowupaxekumeji.pdf
    • https://cdn.shopify.com/s/files/1/0435/6295/9006/files/5309427856.pdf
    • https://cdn.shopify.com/s/files/1/0439/4795/0248/files/95841035709.pdf
    • https://cdn.shopify.com/s/files/1/0431/0899/1140/files/sepazat.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32852202686.pdf
    • https://cdn.shopify.com/s/files/1/0428/1827/3446/files/nepinosekopatefumoxavu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3915/2535/files/osteoporosis_tratamiento_nutricional.pdf
    • https://cdn.shopify.com/s/files/1/0439/2786/3464/files/24884111096.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fawalonilon.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/
    • https://cdn.shopify.com/s/files/1/0439/2786/3464/files/24884111096.p

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050bd.bin
947a86bfcfbe724c440f5a42143a7b41567673d8c5e29f1e1c0fab400bc3a91c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50BD 5220 bytes
font_01_sfnt_off00006256.bin
c4515c34347e1ecbebdfa556fb13acd147bbae7a377ef92c6bbce6e10b73ba5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6256 12656 bytes

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