Malicious PDF — malware analysis report

Static analysis result for SHA-256 013561c67bb1b51a…

MALICIOUS

PDF

46.4 KB Created: 2020-08-18 13:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 786a4bb525161656ed920b4085f75498 SHA-1: f8c6e566aae1818412715c0e24c9b782d80b8774 SHA-256: 013561c67bb1b51ab92a52d2853c5ef07b29aa79e9749970380ca3b8ebca5de5
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one heuristic specifically identifying it as a PDF SEO link farm. One of the links points to a known malicious redirector, indicating a malicious intent to lead users to harmful content. The ML classifier also strongly flagged this PDF as malicious.

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=alchemy+classic+guide
    • http://jitowuvoz.kaynashministries.com/uploads/1/3/1/4/131482933/xidox-wovigawelotap-porujejezonozo-bexuli.pdf
    • http://files.shilohchristianband.com/uploads/1/3/1/4/131437823/b25822a178f.pdf
    • http://boredu.saltandhoneycooking.com/uploads/1/3/0/7/130775519/badisebuzonejet-kikepupifiz-dodawuxepogop.pdf
    • http://repina.dougsheat.com/uploads/1/3/0/9/130969060/07f55b8f2d70.pdf
    • http://files.pfcmooremess.com/uploads/1/3/0/7/130776072/65264bc54.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3897/3857/files/acrostichum_aureum.pdf
    • https://cdn.shopify.com/s/files/1/0431/3831/8487/files/tegujokukexevabewuzot.pdf
    • https://cdn.shopify.com/s/files/1/0459/9601/5773/files/ponazaxetedadifo.pdf
    • https://cdn.shopify.com/s/files/1/0448/1312/3744/files/ansys_workbench_full_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0432/2403/9592/files/kamuguxonurixopagirubu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9055/8620/files/buxijiduduxotoda.pdf
    • https://cdn.shopify.com/s/files/1/0434/3214/9148/files/jakovaxiramamifelasib.pdf
    • https://cdn.shopify.com/s/files/1/0429/4089/1292/files/27274199212.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85450973079.pdf
    • https://cdn.shopify.com/s/files/1/0431/9802/1793/files/haematology_laboratory_tests.pdf
    • https://cdn.shopify.com/s/files/1/0434/1334/0312/files/jutatawizoxumevoti.pdf
    • https://cdn.shopify.com/s/files/1/0430/2798/8634/files/52592649793.pdf
    • https://cdn.shopify.com/s/files/1/0434/6662/1094/files/14381807613.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074fc.bin
07ee7fd5ee8574f3cbdb9e6e63d590d6ac1fa35b406a8f37d84f905fa38c8a86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74FC 5348 bytes
font_01_sfnt_off00008707.bin
8ecf803fbfbe29dd02ac4d15e37371672d8a91a78647eb49e9f40871517b9bec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8707 11016 bytes

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