Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a16f0a88994ac8f…

MALICIOUS

PDF

43.7 KB Created: 2020-07-10 15:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbd8f9b90a184b907938e7f20c1e4745 SHA-1: e46405a71132c364e1c45f400c80efd8609263e2 SHA-256: 4a16f0a88994ac8fb5f5e6fcef471a7d458c6119c05814668dfc4d33d4d948bb
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, including a known malicious redirector at https://ttraff.cc/wb?keyword=parkinson%20gpc%20pdf. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of numerous links suggests a link farm or redirection attack designed to lead users to 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.cc/wb?keyword=parkinson%20gpc%20pdf
    • http://files.caribbeanwesleyan.org/uploads/1/3/1/6/131606720/mobuk_tasusifuje.pdf
    • http://files.arvadaconcrete.org/uploads/1/3/1/6/131606173/minov.pdf
    • http://files.coflats.net/uploads/1/3/0/9/130969986/842ed3ac597.pdf
    • http://files.drawntolead.org/uploads/1/3/2/6/132696155/3601c785951463d.pdf
    • http://files.peakhealthcaremaryland.com/uploads/1/3/1/4/131406816/rizapisopasiraluzoga.pdf
    • http://files.thebetterbrasspipe.com/uploads/1/3/2/7/132740218/daf3e1d8396c143.pdf
    • http://files.zsystemsorder.com/uploads/1/3/0/7/130739503/1818911.pdf
    • http://files.silkbridaleaston.com/uploads/1/3/1/3/131384495/29d31933348.pdf
    • https://vipisaga.files.wordpress.com/2020/07/48294626317.pdf
    • https://bazazexa.files.wordpress.com/2020/06/57769237998.pdf
    • https://wovabaximiro.files.wordpress.com/2020/07/tamamavof.pdf
    • https://ramebojuje.files.wordpress.com/2020/07/dowediguvogorelopapevomi.pdf
    • https://vigesewidep.files.wordpress.com/2020/06/91210442404.pdf
    • https://vugifiwa.files.wordpress.com/2020/07/64358973154.pdf
    • https://kesegomub.files.wordpress.com/2020/07/vegodogexomowilowab.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xutuxajaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nifafujejugafux.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/25322908130.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sivezijikok.pdf
    • https://cdn.shopify.com/s/files/1/0430/3713/0914/files/rinexowaroregitidedojan.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37263727017.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_off00006dbb.bin
64b2b82de8c0bcf1184354d9f161ff20e45c111957182360b90286d7e41dedf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DBB 4944 bytes
font_01_sfnt_off00007e87.bin
68428f1a768c4b7f75cf2c86eece0161b9494e8092284779d007823d19232f8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E87 10320 bytes

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