Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a5fa0d6332babf…

MALICIOUS

PDF

49.8 KB Created: 2020-09-02 01:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e47994d02116b88bc94ab7f3601d008f SHA-1: b2929db30bf94d869ff25b4b9773cb02cda75c23 SHA-256: c3a5fa0d6332babfa7422152cfdfe39da0dc202534d12f6e92c315944f9cc99d
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic indicating it contains a redirector link to known malicious infrastructure. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external resources. The primary malicious IOC is the redirector URL, which is likely used to lure victims to a compromised site.

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/wix?keyword=bodyguard+south+movie
    • https://static.usrfiles.com/ugd/93c935_51115889ac5849f79b7dbda8f65b80aa.pdf
    • https://static.usrfiles.com/ugd/60933b_fd7c3bac65ce465f8022908c61ee30d7.pdf
    • https://static.usrfiles.com/ugd/b8c837_350ed67898fa49bc8ca490459bc7a8c9.pdf
    • https://cdn.shopify.com/s/files/1/0439/8543/6830/files/high_graphics_android_racing_games.pdf
    • https://cdn.shopify.com/s/files/1/0433/9934/8389/files/jegemodepawivezefig.pdf
    • https://cdn.shopify.com/s/files/1/0436/9599/7096/files/informal_letter_writing_topics_for_class_7.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/7868051279.pdf
    • https://cdn.shopify.com/s/files/1/0433/9888/9635/files/hafele_hardware_catalog.pdf
    • https://static.usrfiles.com/ugd/b8c837_2db2002e193248a18b424bbcb42f1051.pdf
    • https://static.usrfiles.com/ugd/4f92c1_1b1d9659195748f5a7b924eba1038add.pdf
    • https://static.usrfiles.com/ugd/df4650_6957248fa83a40da81106898f5d8f7c3.pdf
    • https://static.usrfiles.com/ugd/0511f5_1a458a7f3cd24a69b87321ab770dada0.pdf
    • https://static.usrfiles.com/ugd/9f06f8_7e6ecc13241941c7a08790faf24f5912.pdf
    • https://static.usrfiles.com/ugd/035627_363e885e186f41f1ad61b7349eaea8fe.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006200.bin
2e6af42e777bb1bfc1f13b72a405112a1a9dd1dade9f3a1667eec45b276d0f71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6200 5192 bytes
font_01_sfnt_off000073bb.bin
dcfb003579d26785c899a285168ed9821f370a911144aee19865926a18e9cb93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73BB 10220 bytes
font_02_sfnt_off000096e6.bin
ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96E6 16164 bytes
font_03_sfnt_off0000abff.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABFF 4324 bytes

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