Malicious PDF — malware analysis report

Static analysis result for SHA-256 875c48139c9a1ad2…

MALICIOUS

PDF

67.2 KB Created: 2020-08-19 17:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cff5595dd861818ab92583be227e0f2d SHA-1: 9f5b4134fa818fade022ce516f5e3e1fc3e152d4 SHA-256: 875c48139c9a1ad279e9944ca09eb44bee2f33054e9992c7c26ee621211220d4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link farm and a direct link to a known malicious redirector, ttraff.com. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to disguise malicious activity within a seemingly legitimate report. The ML classifier also strongly indicated maliciousness.

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=reelfoot+lake+fishing+report+september+2018
    • http://mawida.berwickpsychologyandhypnosis.com/uploads/1/3/1/3/131398473/zuxukerisuwow_kiluxiwu.pdf
    • http://nijepon.indonesiaagainstaids.org/uploads/1/3/2/3/132302780/toworo-ribapivumopon-joxivanenitawob-tefujozabemirin.pdf
    • http://penufawem.unlimitedpotentialstl.com/uploads/1/3/2/6/132681647/7313179.pdf
    • http://files.mainlinelawns.com/uploads/1/3/0/7/130738614/896433.pdf
    • http://files.marialisapolegatto.com/uploads/1/3/1/3/131383681/59b165107.pdf
    • https://cdn.shopify.com/s/files/1/0438/6163/9318/files/14947884854.pdf
    • https://cdn.shopify.com/s/files/1/0431/4172/6370/files/bibukenipelirovepokem.pdf
    • https://cdn.shopify.com/s/files/1/0438/3840/6806/files/98046163783.pdf
    • https://cdn.shopify.com/s/files/1/0430/4027/6642/files/sodamurezafo.pdf
    • https://cdn.shopify.com/s/files/1/0428/4760/0807/files/dovinujaxe.pdf
    • https://cdn.shopify.com/s/files/1/0431/7167/6314/files/sns_pneumatic_cylinder.pdf
    • https://cdn.shopify.com/s/files/1/0429/0641/9367/files/bijofedabazexen.pdf
    • https://cdn.shopify.com/s/files/1/0431/8117/9037/files/madepijokedaguned.pdf
    • https://cdn.shopify.com/s/files/1/0430/8349/7623/files/c._p._u_information_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0438/2159/6834/files/farulalagirewufuwumaraf.pdf
    • https://cdn.shopify.com/s/files/1/0437/8420/8545/files/air_fryer_cookbook_ebook.pdf
    • https://cdn.shopify.com/s/files/1/0440/8393/7432/files/tudarizumurasaluzirivo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c502.bin
d33a7ea71114f5f1b15571670a44929f90b87f0ce18bb263dfaff774b39f041d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC502 6044 bytes
font_01_sfnt_off0000d965.bin
526630acaa2b4bb6381395a566fdcc11b8a4d62028c4ce3f5aaf7959cdc03d7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD965 10580 bytes

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