Malicious PDF — malware analysis report

Static analysis result for SHA-256 4184fc566c257be6…

MALICIOUS

PDF

44.3 KB Created: 2020-08-30 02:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca0fd2055143b9f150fb5db4c0952ccb SHA-1: b5e0052e6d9d65e6e23a7b1af634739511a8a6b2 SHA-256: 4184fc566c257be62aa226e8aa58c8695ffd56d372a513998c0536733863475b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=bryson+tiller+let+me+explain+download'. This URL is presented within the document body, disguised as a search result for a song download, indicating a social engineering lure. The presence of a large number of external PDF links, many pointing to static.usrfiles.com, suggests a link farm or SEO poisoning tactic to improve search engine ranking for malicious content. 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.cc/wix?keyword=bryson+tiller+let+me+explain+download
    • https://static.usrfiles.com/ugd/b8c837_5d022ded13ab4a9d99075086d5c7d35d.pdf
    • https://static.usrfiles.com/ugd/b8c837_8341131268b34d49abf5fd162fc899af.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c2bd1ba2946422e9b18d87b97acfd0e.pdf
    • https://cdn.shopify.com/s/files/1/0436/5176/0281/files/surface_active_ethylene_oxide_adducts.pdf
    • https://cdn.shopify.com/s/files/1/0434/4319/1960/files/aws_cwi_exam_questions.pdf
    • https://static.usrfiles.com/ugd/3b0c81_60291ef39cc74b32bd77821370acd12b.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f949fd4c32245dea35cfdcd393a6c3a.pdf
    • https://static.usrfiles.com/ugd/b8c837_78b162e72da3437086b193559b6a6bf9.pdf
    • https://static.usrfiles.com/ugd/b8c837_17019950445d40e2b4290c7219e8af36.pdf
    • https://static.usrfiles.com/ugd/cc03df_37619894e72f469b90ba0dc970fb8eb0.pdf
    • https://cdn.shopify.com/s/files/1/0429/3237/1622/files/giwebegukifev.pdf
    • https://cdn.shopify.com/s/files/1/0432/7230/6852/files/halliday_and_resnick_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/5093/3156/files/fakek.pdf
    • https://cdn.shopify.com/s/files/1/0437/7473/8593/files/63255476084.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2518/files/pojede.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e35.bin
41f8c91616b3f56d7a336870fe874c174507ee29d290512860c30574795a1207		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E35 5416 bytes
font_01_sfnt_off0000609f.bin
b8fa11d8dbd05e69fed2812818c6729ad910ee52c35ea129fdc65cb817ed99ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x609F 10516 bytes
font_02_sfnt_off00008492.bin
dabf0ccc451caf4864c9b22ca91318a92e8f625b469dd0561edf59b451c7a792		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8492 18776 bytes

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