Malicious PDF — malware analysis report

Static analysis result for SHA-256 9626db702690ef2b…

MALICIOUS

PDF

43.2 KB Created: 2020-08-31 09:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ce08d0ef34601981b6fcf0b33532422 SHA-1: e40a687be22df10d16bc2460ad209efd80fe7768 SHA-256: 9626db702690ef2ba5557e4e2ccbc35af28406eb3eb30cb46537dfb83065fa6d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains the malicious URL. The presence of numerous links, including to shopify.com, suggests a link farm or SEO manipulation tactic to disguise the malicious redirector. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=here+i+am+jonathan+safran+foer+pdf
    • https://cdn.shopify.com/s/files/1/0439/8658/3710/files/composite_materials_nptel.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lavatorumagenikezelun.pdf
    • https://cdn.shopify.com/s/files/1/0431/3346/8821/files/dokikawiwufolezorerabo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7873/7302/files/rastafarian_history_pdf.pdf
    • https://static.usrfiles.com/ugd/b4609a_b4ac014186e44bb0a134a02d983a0c05.pdf
    • https://static.usrfiles.com/ugd/cec570_cebd04b8ce6c45b78dd111d1a108f856.pdf
    • https://cdn.shopify.com/s/files/1/0435/8891/1267/files/el_jarron_azul.pdf
    • https://cdn.shopify.com/s/files/1/0434/9794/7300/files/batman_movie_tamil.pdf
    • https://static.usrfiles.com/ugd/b8c837_c0490332ced44525988ae3e4ed2cb481.pdf
    • https://static.usrfiles.com/ugd/e7e4a0_557dc623585c48b1962f0898818caca1.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_off00006b6e.bin
df21d53e67b79bb5731c464e7902340b722de842703572a3736d954d2b71b4be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B6E 5284 bytes
font_01_sfnt_off00007d35.bin
286497b4c18b1b1a79f6301498341629d34e890e3d8ffbe3f9d4bb95dbe73590		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D35 10352 bytes

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