Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a5a12c31e175911…

MALICIOUS

PDF

39.2 KB Created: 2020-08-18 20:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0519bcc0622137212e881cbc2c37deb5 SHA-1: 9d843f607015b223070236acdf75879c8f03bf55 SHA-256: 6a5a12c31e17591101443bf372c7850bc49b17734b1e45e5bc7ca427dbb1f270
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm of 10 external PDF links, with the primary link pointing to a known malicious redirector. This suggests an attempt to lure users to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine the exact payload or final destination.

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.cc/pify?keyword=beautiful+wallpapers++for+desktop
    • http://files.mooreimprints.com/uploads/1/3/0/7/130775025/56bef0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0544/3233/files/ping_g20_driver_reviews.pdf
    • https://cdn.shopify.com/s/files/1/0433/3810/5000/files/474112951.pdf
    • https://cdn.shopify.com/s/files/1/0428/6591/8118/files/local_agenda_21_malaysia.pdf
    • https://cdn.shopify.com/s/files/1/0449/9429/8014/files/ridurexosiduwatimasaj.pdf
    • https://cdn.shopify.com/s/files/1/0429/6625/3724/files/bonfire_of_the_vanities_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/6073/1808/files/rerejasasipidawe.pdf
    • https://cdn.shopify.com/s/files/1/0431/7714/8571/files/krav_maga_techniques_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/1446/3394/files/63203783153.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8104/files/tadujutabewiwojewanokat.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_off00005b60.bin
2d5798e85b5719169ea7948bdeda2cb1c5fd3e0684453413e05dd3ccdd350c35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B60 5240 bytes
font_01_sfnt_off00006d55.bin
3eb43424973889bef4ef193d040a5ea31c842ab3e37eb5b7574470c2fc2e7620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D55 10332 bytes

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