Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb06b75ba1a46f8…

MALICIOUS

PDF

39.8 KB Created: 2020-09-01 11:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58ed2077e8c8973860a86ef7aec624cf SHA-1: 8ddb258babff50875247f8cee982ef94e9606aa2 SHA-256: 5fb06b75ba1a46f873996260b06a9248f8b7dd09b80d7787f8367b832de7fdfd
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Google sheets drop down list' and the malicious URL, suggesting a phishing lure. The presence of many external PDF links indicates a link farm, likely used to obscure the malicious 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.ru/wix?keyword=google+sheets+drop+down+list
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/87d215_3f49c12a5cf74c2f9748d26b34151187.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce054c7d533441bb908d312701f67b71.pdf
    • https://static.usrfiles.com/ugd/b8c837_34fa6af42e7b403eb7b92b7bac34a2cf.pdf
    • https://static.usrfiles.com/ugd/df4650_65e904bca4be4ea384f031fad7fe9aec.pdf
    • https://static.usrfiles.com/ugd/b8c837_587e896de49d4d42a7a8fb22847c1373.pdf
    • https://static.usrfiles.com/ugd/d2cc1f_b04115a9603346079a1227ebc9ef1aeb.pdf
    • https://static.usrfiles.com/ugd/b8c837_7d3cd954f1da4bada83340c99be8475f.pdf
    • https://cdn.shopify.com/s/files/1/0434/2281/0263/files/80936999510.pdf
    • https://cdn.shopify.com/s/files/1/0428/1368/5927/files/33232349442.pdf
    • https://cdn.shopify.com/s/files/1/0434/3844/0604/files/corsair_k55_rgb_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/9385/9231/files/advantages_and_disadvantages_of_learner_centred_approach.pdf
    • https://cdn.shopify.com/s/files/1/0438/2064/6562/files/fimumudenazo.pdf
    • https://static.usrfiles.com/ugd/b50c55_7206673a48d4470a8fda859da4f8f3e9.pdf
    • https://static.usrfiles.com/ugd/269bb8_31cf696d415c41bca84ef645748da5d4.pdf
    • https://static.usrfiles.com/ugd/c3f88d_423dbe13e0504f80adb2e41c811c1da7.pdf
    • https://static.usrfiles.com/ugd/b8c837_8ea233189bf04c219ac4b3a37f1225a2.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a46d5b8ab294e7a97e3382c3e3bb177.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_off00005ece.bin
36fba09e869d3432123c1fd440f4d12ec9ededacf37a87cffa6002bd9f1406cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ECE 5136 bytes
font_01_sfnt_off00007056.bin
96669688c10dc7fd1f9ea0631628df928a225a2e3f2a42941de37a0ec91f82c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7056 9948 bytes

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