Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2956f68afc3a16…

MALICIOUS

PDF

48.7 KB Created: 2020-08-21 13:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13830ca374f36f715ace90405fc8910f SHA-1: 138c9446b702f816c6d1b369fb0e74b6c4e91cc0 SHA-256: 4a2956f68afc3a165327e00aa7643e9b3179268ca8c2c2ffcc9df3577cae2806
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a significant number of embedded links. One critical heuristic indicates these links point to a known malicious redirector infrastructure, specifically `https://ttraff.ru/pify?keyword=love+message+apk+app`. Another heuristic identified a large PDF link farm, with many links hosted on `cdn.shopify.com`. The document body, though heavily obfuscated, also contains the URL `https://ttraff.ru/pify?keyword=love+message+apk+app` and several `cdn.shopify.com` URLs, suggesting a coordinated effort to lure users to potentially harmful 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.ru/pify?keyword=love+message+apk+app
    • http://files.brandingfaithdesigns.com/uploads/1/3/0/7/130739856/pudazosi_nikitezowinadu_kotud_tuvawademakat.pdf
    • http://wixofo.mcnamarakenney.net/uploads/1/3/1/4/131452883/mumigawiv-tupebe-buganoxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7963/8942/files/kupox.pdf
    • https://cdn.shopify.com/s/files/1/0431/7832/8221/files/80242839815.pdf
    • https://cdn.shopify.com/s/files/1/0435/4175/8101/files/8212232841.pdf
    • https://cdn.shopify.com/s/files/1/0432/4337/2703/files/bwakila_new_comedy.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mowojemabedeju.pdf
    • https://cdn.shopify.com/s/files/1/0432/5936/3483/files/nuwezoxu.pdf
    • https://cdn.shopify.com/s/files/1/0436/0372/2398/files/37255212589.pdf
    • https://cdn.shopify.com/s/files/1/0435/8383/2227/files/bilayer_floating_tablets.pdf
    • https://cdn.shopify.com/s/files/1/0427/4513/5260/files/famifumifogoba.pdf
    • https://cdn.shopify.com/s/files/1/0431/4316/8156/files/ca_medular_de_tiroides.pdf
    • https://cdn.shopify.com/s/files/1/0435/2137/6410/files/bomoba.pdf
    • https://cdn.shopify.com/s/files/1/0436/9884/7896/files/kudinuzokina.pdf
    • https://cdn.shopify.com/s/files/1/0432/5353/0788/files/menulejudojibixiva.pdf
    • https://cdn.shopify.com/s/files/1/0438/5875/5749/files/ubqari_magazine_april_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/8130/2167/files/67697250338.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/
    • https://cdn.shopify.com/s/files/1/0432/5353/0788/files/men

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c3c.bin
bc088e02f0648cdb090158f7af03de3938698578a6701e1e59648c222589eaa1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C3C 5076 bytes
font_01_sfnt_off00006d7f.bin
5350b92e28945da3c718589840ca16ce9b16d244ff19875df27511f0d1d40de7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D7F 3124 bytes
font_02_sfnt_off00007a6a.bin
4246c875eace8158106aeb77d91f720173d32b2ef3933abe0bab34db3306b1a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A6A 10432 bytes
font_03_sfnt_off00009e6e.bin
4b52fd5da643d9c08cc0a86f773b2f024e3274f3f861dfcac100db1ef433cf06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E6E 16164 bytes

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