Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f2d62663707eb4c…

MALICIOUS

PDF

46.5 KB Created: 2020-08-14 15:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: daf57b5024e0ab1d424e3c48c445c1f0 SHA-1: 15cb774d7dbee547c201c3675f03a9f5b3a873c7 SHA-256: 9f2d62663707eb4c261167e774aee9632953ffc2a03b3a2e56e133854362d3d9
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 designed to appear as a guide for 'Risk of Rain 2 characters', but the primary link redirects to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and a URL that appears to be part of 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.com/pify?keyword=risk+of+rain+2+characters+guide
    • http://wezuxigu.mooloco.com/uploads/1/3/1/6/131637789/9616132.pdf
    • http://files.mayusilkart.org/uploads/1/3/1/3/131383664/2245704.pdf
    • http://files.pinehurstmanorhoa.com/uploads/1/3/1/8/131859261/xopipewi_xusulogunow.pdf
    • http://files.orchardhillsbangor.com/uploads/1/3/0/7/130740389/kizekafokeruxil.pdf
    • http://files.gaustinpaintings.com/uploads/1/3/0/7/130739593/daforirur.pdf
    • https://cdn.shopify.com/s/files/1/0432/8597/1110/files/munavo.pdf
    • https://cdn.shopify.com/s/files/1/0428/6060/9692/files/xiramovofuwimaz.pdf
    • https://cdn.shopify.com/s/files/1/0454/8162/3702/files/nobefela.pdf
    • https://cdn.shopify.com/s/files/1/0428/8852/8035/files/russian_alphabet_writing_practice_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/5738/9472/files/11316533295.pdf
    • https://cdn.shopify.com/s/files/1/0448/2295/4141/files/abscesso_cerebral_tratamento.pdf
    • https://cdn.shopify.com/s/files/1/0438/2697/0786/files/xalaxinemekaladu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9432/7961/files/anemia_falciforme_en_embarazo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9635/9580/files/milomivobofuziw.pdf
    • https://cdn.shopify.com/s/files/1/0432/4727/2098/files/natevegitufemazakazejalum.pdf
    • https://cdn.shopify.com/s/files/1/0432/2004/1886/files/wenedopigu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0315/8433/files/whispers_of_yenwood.pdf
    • https://cdn.shopify.com/s/files/1/0429/2060/7900/files/critical_path_method_solved_problems.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_off00007704.bin
6c3b81ccb7a8061ff8385725e3f5fab1d8e53dbcdbf582626dfa3437441ed9f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7704 5456 bytes
font_01_sfnt_off0000898a.bin
9562512f3eb704232b87c5b5b0151ac32b720fd7b27f83df3d26f7ec1b92639f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x898A 10408 bytes

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