Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4088a9c2532de3a…

MALICIOUS

PDF

43.7 KB Created: 2020-08-29 01:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33aad43288fe35640adb0759e8093bcc SHA-1: b4f1927bbc09f7b9574cfaf4274f74f3ba3282f4 SHA-256: c4088a9c2532de3ad6738632212a10fdc0a31c06864ebc6d6da8df630baca078
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that leads to this malicious infrastructure. The presence of a large number of external PDF links, many pointing to the same domain, suggests a link farm used for SEO poisoning 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=darkest+dungeon+crimson+court+map
    • https://static.usrfiles.com/ugd/b8c837_cb2f945a99de44179f77e90f28237104.pdf
    • https://static.usrfiles.com/ugd/b8c837_aecadd9cdb7045529b35631a50221f2e.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d49e5c5caf9482085299ed73482cb7e.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e7a4bebcde24c5bb37706e604b3668f.pdf
    • https://cdn.shopify.com/s/files/1/0462/5622/6458/files/cbse_net_application_form_2019.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5825/files/verbe_avoir_en_anglais_forme_ngative_preterit.pdf
    • https://cdn.shopify.com/s/files/1/0431/7646/0448/files/73328829498.pdf
    • https://cdn.shopify.com/s/files/1/0429/3355/1260/files/59059466960.pdf
    • https://cdn.shopify.com/s/files/1/0431/7030/0065/files/alien_vs_predator_arcade_game_pc.pdf
    • https://static.usrfiles.com/ugd/b8c837_7101b0d36d224c09a1dfc957bd7963af.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f0d6ebb48224e0291c738e83f12f25a.pdf
    • https://static.usrfiles.com/ugd/b8c837_f1147572b55143cc93c1682e22796521.pdf
    • https://static.usrfiles.com/ugd/b8c837_ae03b30485084813961b24a2ed935480.pdf
    • https://static.usrfiles.com/ugd/b8c837_d307585f8fdc43e7ab79e7c39acc6d58.pdf
    • https://static.usrfiles.com/ugd/b8c837_92a3d4561d52403aa067b1a14aca6fb0.pdf
    • https://static.usrfiles.com/ugd/b8c837_31479c064bf04226a7aae5c8694e822c.pdf
    • https://static.usrfiles.com/ugd/b8c837_005d6b644292442da998f3d4725c3f8a.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_off00006c88.bin
d0177ce2018609a235ec42782297b28e97d9dcdbe9c520c1f239d536a3bfb6d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C88 5424 bytes
font_01_sfnt_off00007eea.bin
ebda706010a0e362eeb472430c5100b5dcc2c615bc8c7445bcaf08822fa8c049		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EEA 10328 bytes

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