Malicious PDF — malware analysis report

Static analysis result for SHA-256 9275fcaec6b106b1…

MALICIOUS

PDF

43.4 KB Created: 2020-09-01 03:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2325fc61a8834d3d44b444ccc4bcdbd SHA-1: 2c5a58f3d57ea83160e26709e94bdc5a25889472 SHA-256: 9275fcaec6b106b1c7c3da937c640442f1727776eef6a5fe77084f7e022b696f
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=biosynthesis+of+peptide+hormones+pdf'. This URL is likely part of a phishing or scam campaign designed to trick users into clicking through to malicious content. The PDF also contains a link farm, further indicating malicious intent. The document body, though heavily obfuscated, contains the same lure text as the malicious URL.

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=biosynthesis+of+peptide+hormones+pdf
    • https://static.usrfiles.com/ugd/7e0eb0_6d43f675c3e64f75abc0b93badc08dae.pdf
    • https://static.usrfiles.com/ugd/3f80ec_e5d5ed1fda244df69f2f13cea53e00cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc49fc282ce94bc688b41131689e017e.pdf
    • https://static.usrfiles.com/ugd/3aee12_31194a95ac8344d8bcac5c57cd95e17f.pdf
    • https://cdn.shopify.com/s/files/1/0434/0423/0805/files/62546693181.pdf
    • https://cdn.shopify.com/s/files/1/0429/3630/3782/files/76948217840.pdf
    • https://cdn.shopify.com/s/files/1/0428/5969/2198/files/juregoxalomiwi.pdf
    • https://cdn.shopify.com/s/files/1/0438/0501/6225/files/43588615336.pdf
    • https://static.usrfiles.com/ugd/289c5e_a944ecf72a1f4e25bd7a6633ffc98b43.pdf
    • https://static.usrfiles.com/ugd/12745a_d76bad007540438685c1e2ba5076fddd.pdf
    • https://static.usrfiles.com/ugd/c0b427_5a961e487f3f42018f6b262357a876dd.pdf
    • https://static.usrfiles.com/ugd/625844_e9a4a184f1a546a98e676495c4e26590.pdf
    • https://static.usrfiles.com/ugd/86319b_ea66537e1e8640b78d6a3ecf5abb6a77.pdf
    • https://static.usrfiles.com/ugd/b8c837_436d222b5ad2406e8b732ce8670b9841.pdf
    • https://static.usrfiles.com/ugd/735424_303c3356d7a2405faed84c50d8b7ed35.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_off00006b01.bin
a21adc47e27d4812a47b168b815523ec3d4ba49829211cc7364951a4d61a220e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B01 5192 bytes
font_01_sfnt_off00007c8e.bin
a98dcd42a5160f520dcb49db05c1645cffccb267ada2df3393c1a04728371abc
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C8E 10408 bytes