Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a0f228b64c1205…

MALICIOUS

PDF

36.3 KB Created: 2020-08-14 21:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f47158aee5841b7eac6de52f494b2525 SHA-1: 9de32f9cb37cd8e0ef66f4d95a5abec180fd0a26 SHA-256: 13a0f228b64c12051444a29227bfe9a54cbfb2182bd932edabb9926cf084b2a1
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to PDF files hosted on various domains, which is indicative of a link farm. One of the primary links, 'https://ttraff.cc/pify?keyword=daily+themed+crossword+answers+july+29', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of this link farm strategy.

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=daily+themed+crossword+answers+july+29
    • http://files.nancyhamiltonfilm.com/uploads/1/3/1/3/131378942/1126070.pdf
    • http://files.inspirational-quotes-about-life.net/uploads/1/3/1/6/131607063/3786536.pdf
    • http://files.lhstv.net/uploads/1/3/0/7/130775458/girevabitijasimu.pdf
    • http://files.building-better-athlete.com/uploads/1/3/1/4/131406258/wusurejof.pdf
    • http://wofijej.puzzledog.ca/uploads/1/3/0/7/130776208/c6c7c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/9112/2584/files/convert_to_jpg_online_100_kb.pdf
    • https://cdn.shopify.com/s/files/1/0431/8812/5857/files/71386513474.pdf
    • https://cdn.shopify.com/s/files/1/0433/1523/2921/files/41868989398.pdf
    • https://cdn.shopify.com/s/files/1/0437/6566/1853/files/ar_15_parts_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0427/3415/7991/files/81220621080.pdf
    • https://cdn.shopify.com/s/files/1/0437/0599/1322/files/e90_bentley_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/80816471789.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/66560453216.pdf
    • https://cdn.shopify.com/s/files/1/0430/9365/5716/files/rajewad.pdf
    • https://cdn.shopify.com/s/files/1/0433/6487/6444/files/69589614745.pdf
    • https://cdn.shopify.com/s/files/1/0439/3864/4123/files/virus_and_bacteria_diseases_list_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/73681980446.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_off00004e5e.bin
73663e3cb81a15fa75a4950e714025c716244307610245a65d1ccaab964b47ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E5E 5736 bytes
font_01_sfnt_off000061d0.bin
62a96f89f5a543a60c1774f08eaa3e863257c660a37bbca5d3794245845120b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61D0 10024 bytes

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