Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4085b56fe7406c5…

MALICIOUS

PDF

41.2 KB Created: 2020-08-19 03:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 315ed458a66cf93f10b1192ffd51a64a SHA-1: 65e897e0c77d55cf59ab2aea93c5f50da6a2ded1 SHA-256: a4085b56fe7406c59a8363228d161dfd1cb512802a2e10faffe1098d4491209c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text related to software and URLs, suggesting a lure for users to download or access malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure itself contained multiple external links, many hosted on cdn.shopify.com, indicating a link farm designed to distribute malicious content.

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.com/pify?keyword=chessbase+12+free
    • http://files.justflowfun.com/uploads/1/3/2/6/132681660/fusezetu-fuzokenokamirot.pdf
    • http://files.studio17hairsalon.com/uploads/1/3/1/1/131163859/bezumo-fovovulewijokew-sizifolarugusi.pdf
    • http://files.wasatchwingschapterh.org/uploads/1/3/2/6/132680908/0ca753450069.pdf
    • http://tavum.caincrossingpoa.com/uploads/1/3/1/3/131379732/4335909.pdf
    • http://wewofot.sonchaserrv.com/uploads/1/3/0/8/130873851/7982259.pdf
    • https://cdn.shopify.com/s/files/1/0432/3662/2498/files/autocad_2010_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/nuzafurezuxamabozatetune.pdf
    • https://cdn.shopify.com/s/files/1/0430/6829/3287/files/vetanonafuzovorojewe.pdf
    • https://cdn.shopify.com/s/files/1/0431/4945/9605/files/4014272551.pdf
    • https://cdn.shopify.com/s/files/1/0431/0630/4166/files/gesajenuxaxekokubusafero.pdf
    • https://cdn.shopify.com/s/files/1/0436/0349/3022/files/fanasetulujemenunaditu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6567/1833/files/35173051868.pdf
    • https://cdn.shopify.com/s/files/1/0433/7496/8986/files/bedrock_font_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/6237/7113/files/519692178.pdf
    • https://cdn.shopify.com/s/files/1/0430/2995/4721/files/17269338802.pdf
    • https://cdn.shopify.com/s/files/1/0428/6509/8908/files/14515244228.pdf
    • https://cdn.shopify.com/s/files/1/0430/7252/0352/files/mixixuripugugutejenexi.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000633c.bin
058cae06c390fe2c1b4aa8f1a8849523c8328490736334b2d5cd9b787da6a160		 pdf-font-stream PDF embedded font (sfnt) at offset 0x633C 5052 bytes
font_01_sfnt_off00007465.bin
d047b85943177f91931cdee36f4ae9dd0134d9dc69eeb50573bd269ea60027a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7465 10560 bytes

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