Malicious PDF — malware analysis report

Static analysis result for SHA-256 29ab0606e49d4199…

MALICIOUS

PDF

39.5 KB Created: 2020-08-13 21:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eda4c16dddf9207192c633cc0984a829 SHA-1: b70cfc2743b299cf3ac53f04dbc5f277a4fd9500 SHA-256: 29ab0606e49d4199cd3a04b45951fe82efc33a71e46ff89d9094a77c98684060
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a large number of external links, indicating a link farm designed to redirect users. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.cc/pify?keyword=barthel+adl+index+pdf. The document body, though heavily obfuscated, also contains this URL and numerous other PDF links hosted on cdn.shopify.com, suggesting a coordinated effort to distribute malicious content through a large number of seemingly benign PDF files.

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=barthel+adl+index+pdf
    • http://files.intelligentwoundcare.com/uploads/1/3/1/3/131380889/43ff6a3e58e.pdf
    • http://files.catchamomentphotos.com/uploads/1/3/0/7/130740017/2257668.pdf
    • http://nonaxifo.madeleinesheils.com/uploads/1/3/0/7/130775542/fuxupavotakukadiguf.pdf
    • https://cdn.shopify.com/s/files/1/0431/7564/1247/files/pulutobesuror.pdf
    • https://cdn.shopify.com/s/files/1/0433/5042/5765/files/69045338063.pdf
    • https://cdn.shopify.com/s/files/1/0428/3544/3875/files/18764842867.pdf
    • https://cdn.shopify.com/s/files/1/0429/4731/3827/files/10451283145.pdf
    • https://cdn.shopify.com/s/files/1/0429/5481/7690/files/gogexewi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6568/files/jusadajaxibum.pdf
    • https://cdn.shopify.com/s/files/1/0434/8860/8418/files/ansi_c_programming_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/8794/4096/files/analyst_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0436/3649/0398/files/41220886625.pdf
    • https://cdn.shopify.com/s/files/1/0437/1313/4757/files/7673575581.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/92923763129.pdf
    • https://cdn.shopify.com/s/files/1/0437/4013/5589/files/bolutewu.pdf
    • https://cdn.shopify.com/s/files/1/0428/0755/8310/files/40990845774.pdf
    • https://cdn.shopify.com/s/files/1/0437/1188/9562/files/20430135380.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_off00005ba5.bin
de0fcc6309599235daeac7f36ab01d0bf499af5180de39fba98c395a6aec486c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BA5 5068 bytes
font_01_sfnt_off00006ce1.bin
c3658de78e335dc1c0100012246ba21e7cfb69944b6c79caeff24ec40ef1e8a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE1 10604 bytes

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