Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c2f3b858848ee5a…

MALICIOUS

PDF

57.5 KB Created: 2020-08-19 02:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f1853764e201f322e8cc47cfdb4bf2d SHA-1: 4d656d83626f2628fa7a35ab934cfb1025ed3388 SHA-256: 6c2f3b858848ee5af628b0a31310f626e5be3a1386e03f365afa0129d0161339
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning tactic. One of the embedded URLs, https://ttraff.ru/pify?keyword=term+end+report+card+comments, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to direct users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious.

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=term+end+report+card+comments
    • http://files.elementaryschoolcounseling.org/uploads/1/3/1/3/131379949/1939712.pdf
    • http://files.nayadaya.com/uploads/1/3/0/7/130739718/2f25a07b8b.pdf
    • http://files.badhabitkustoms.com/uploads/1/3/2/6/132681295/eb00072e71207f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0811/4340/files/tapivisobatofutokexapi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0982/6213/files/fojaludatalujifutamowed.pdf
    • https://cdn.shopify.com/s/files/1/0437/3453/2245/files/5001440918.pdf
    • https://cdn.shopify.com/s/files/1/0437/6811/9448/files/81017920469.pdf
    • https://cdn.shopify.com/s/files/1/0449/7162/2559/files/self_certify_sickness.pdf
    • https://cdn.shopify.com/s/files/1/0434/7281/4245/files/diselizujefidefu.pdf
    • https://cdn.shopify.com/s/files/1/0437/8198/0321/files/vivapirodak.pdf
    • https://cdn.shopify.com/s/files/1/0434/0252/6887/files/regin.pdf
    • https://cdn.shopify.com/s/files/1/0431/6135/4389/files/envision_algebra_2_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0456/4857/6679/files/aashiqui_2_songs_all_remix.pdf
    • https://cdn.shopify.com/s/files/1/0430/7035/7661/files/4629757757.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000099e2.bin
4aba2bb845853324476be69e5ed1bf4ff35002942389efac2b843cac1129f0e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99E2 2828 bytes
font_01_sfnt_off0000a3dd.bin
2c552eb33e33c71b29ee4c903b82dd851baf9b4b01c60d4da2acfeb5c30c7874		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3DD 5136 bytes
font_02_sfnt_off0000b52f.bin
c72a9171233075bb830e064e2135f13891a1f283082520e83dc9a56254eef40a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB52F 10420 bytes

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