Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fa48bf4d270c7c2…

MALICIOUS

PDF

51.3 KB Created: 2020-08-30 13:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1398dd4d9b1b4666badcd258d6997922 SHA-1: 41775f084060478da1f21bb2a37dee87ce8c3e09 SHA-256: 6fa48bf4d270c7c294463e3bb7c0f690fbf3aea4ede20290121d93acd8ea30ba
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one heuristic specifically identifying a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are part of a link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, but the presence of malicious links is the primary indicator of compromise.

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/wix?keyword=belajar+bahasa+arab+bagi+pemula+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/078c79_2c02c44ce8e84ab9a5c31a9915482580.pdf
    • https://static.usrfiles.com/ugd/b8c837_6bb7376ddafa4b858ccae59bcf8f2591.pdf
    • https://static.usrfiles.com/ugd/9cc572_96281f92ec0f4d7dbbfe2335c137f9c7.pdf
    • https://cdn.shopify.com/s/files/1/0437/6032/0669/files/70400346650.pdf
    • https://cdn.shopify.com/s/files/1/0427/4972/2790/files/mujikipazijenatexe.pdf
    • https://cdn.shopify.com/s/files/1/0429/9633/4753/files/ciara_ren_c3_a9e.pdf
    • https://cdn.shopify.com/s/files/1/0430/9614/6073/files/97525157973.pdf
    • https://cdn.shopify.com/s/files/1/0429/6700/7386/files/datefimimujemakonalefa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/xekasisexizobuvogod.pdf
    • https://static.usrfiles.com/ugd/b8c837_56a2082fa5534f109682c165d8792389.pdf
    • https://static.usrfiles.com/ugd/b4609a_7211de26f3b640aa91c8eb5794c93211.pdf
    • https://static.usrfiles.com/ugd/43d598_fe8adeb690d14c949979e51af580ede0.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000964b.bin
1489e6f7ee5791384fbd680009f1766784cf52440810860c2a2d205c78ad7453		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x964B 23332 bytes
font_00_sfnt_off00005f61.bin
368edfa598cb60a5072cc23971be1aa1ad13a2a799e8d970d1da8ea162909b84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F61 5720 bytes
font_01_sfnt_off000072b2.bin
ae1e998e3d7326cd11daed085c66a1fe8b4e191292ca5631cd3669f9143bca32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72B2 10720 bytes

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