Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e5cc90c747a936…

MALICIOUS

PDF

45.9 KB Created: 2020-09-11 06:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbbf8f9e46529833d22c261993bfcec5 SHA-1: 7e8cee9c1be35ae64db490efdc8ca230bb3fa924 SHA-256: 41e5cc90c747a93620cc8c08a454e9d66f40aca9c0ac938de7124edffd8e3fbb
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic firing for a malicious redirector link and another for a PDF link farm. The document body, though heavily obfuscated, contains the URL 'https://ttraff.me/wix?keyword=simple+tattoo+flash+sheets', which is flagged as a malicious redirector. The presence of many links to external PDFs suggests an attempt to manipulate search engine results or to distribute further 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.me/wix?keyword=simple+tattoo+flash+sheets
    • http://files.relst-uhag66.com/uploads/1/3/1/4/131407530/jokonufenimokon-gerame.pdf
    • http://nekunerej.cavertwire.com/uploads/1/3/1/4/131452958/2710910.pdf
    • http://roruk.dressedinitaly.com/uploads/1/3/1/3/131380594/gosomidadura_nunuj_mogabifige_kowidadasifix.pdf
    • http://files.chezchase.com/uploads/1/3/1/4/131437669/6444895.pdf
    • https://cdn.shopify.com/s/files/1/0440/8537/9237/files/zuxabajegiwuge.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3351/files/muliwubufenalosowugowaror.pdf
    • https://cdn.shopify.com/s/files/1/0432/4638/7367/files/intel_corporate_brand_identity_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0435/4736/1439/files/south_african_maternity_leave_forms.pdf
    • https://cdn.shopify.com/s/files/1/0432/0090/5373/files/instagram_liker_script.pdf
    • https://static.usrfiles.com/ugd/0049ca_c0b35a02bfed44ad877ae766a0b053e9.pdf
    • https://static.usrfiles.com/ugd/79e0dc_4ea627286c4e4295ac6ecd6f5ee859f8.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_29ae22d6bfd64c4fbb9b73f479e890e4.pdf
    • https://static.usrfiles.com/ugd/b8c837_408e0eff55044fd68ccb7aff459136fc.pdf
    • https://static.usrfiles.com/ugd/cc207a_19f15e6e1b9f4bf8ace1f37b718a13cb.pdf
    • https://static.usrfiles.com/ugd/ee4d88_d2b03927a8e04aafb47db54a786a8a1d.pdf
    • https://static.usrfiles.com/ugd/2ca09c_7347efe71bd7433da45b7af4fff0f672.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_off00006cec.bin
ff160a89c0e3e9ada70953cd02f0e694da525bfa901a1b56816792b505cfe1d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CEC 5148 bytes
font_01_sfnt_off00007e4a.bin
57c80cbbd24ef7b0b21d58daeba58dfcbd65ca9cc4d591b6b427990f4994a461		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E4A 14112 bytes

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