Malicious PDF — malware analysis report

Static analysis result for SHA-256 598bc5baad22caaa…

MALICIOUS

PDF

49.3 KB Created: 2020-08-20 01:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed14e5ab9e1e58576b8de3865798dcd0 SHA-1: 4b28f065ea43633b65b0550d626706dd6e2c9196 SHA-256: 598bc5baad22caaa5c9c62e998b3faa1a4bbcf8c92cc3286533f361c77134d9e
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of the primary links, 'https://ttraff.ru/pify?keyword=karl+marx+conflict+theory+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other links, suggesting a link farm or redirection scheme designed to lead users to malicious content. The ML classifier strongly supports the malicious verdict.

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=karl+marx+conflict+theory+pdf
    • http://korilugu.keyvisioncoaching.com/uploads/1/3/1/3/131380005/dojamurise.pdf
    • http://nelutasix.msvetter.com/uploads/1/3/1/3/131379434/nofilufavul_dadoxibugogoz_madurojozata.pdf
    • http://files.brittabelle.com/uploads/1/3/2/8/132815359/ce9a061.pdf
    • https://cdn.shopify.com/s/files/1/0434/8385/7053/files/islamic_banking_and_finance_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/bujovewenevemik.pdf
    • https://cdn.shopify.com/s/files/1/0433/6209/1167/files/pdf_attention_deficit_hyperactivity_disorder_a_handbook_for_diagnosis_and_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0427/3537/0407/files/soviwetisujagem.pdf
    • https://cdn.shopify.com/s/files/1/0428/1237/5207/files/99993837775.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pizegavegip.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/serananovuja.pdf
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/guzeloxivepizemejafifa.pdf
    • https://cdn.shopify.com/s/files/1/0429/5789/7882/files/27566773657.pdf
    • https://cdn.shopify.com/s/files/1/0432/8305/4757/files/71224673510.pdf
    • https://cdn.shopify.com/s/files/1/0428/0470/7491/files/42224440458.pdf
    • https://cdn.shopify.com/s/files/1/0434/4145/5254/files/lujobavetowajo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0749/8647/files/calcium_chloride_msds_sigma.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_off000082d0.bin
5130f164c7d45ece957b1146aa8297033b81dd874ca690ec78bf9fb38c40b374		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82D0 5356 bytes
font_01_sfnt_off000094e4.bin
6948e3da070f6cf97e796f0511888702431d77fcf015cc632512e6ddbe66608f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94E4 10304 bytes

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