Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df9713004ef35e2…

MALICIOUS

PDF

44.4 KB Created: 2020-09-01 22:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 313c85097d64088d5a71b680f53bca85 SHA-1: 0c280478ae3fe980a9f941bdaba00e9e48b2148e SHA-256: 8df9713004ef35e2ac5599f88938b66f75b71ff1eae42079fc16628236c49f1f
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as an app store notification, aiming to trick users into clicking it. The link leads to 'https://ttraff.com/pify?keyword=android+app+not+available+in+play+store', which is a known malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other PDF links, suggesting a link farm or redirection tactic. The ML classifier strongly flagged this PDF as malicious.

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/pify?keyword=android+app+not+available+in+play+store
    • https://static.usrfiles.com/ugd/c34aa9_defc9056af0b4b3ea2fc4a133e2de07b.pdf
    • https://static.usrfiles.com/ugd/1cfe37_86c1a9e375f64f8c8a1f7bbfe6c6156b.pdf
    • https://static.usrfiles.com/ugd/5b604d_3f2e005c11964987aebe50c7526b1e4a.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6279/files/49596494860.pdf
    • https://static.usrfiles.com/ugd/b42fd6_d5c5fccaa3ba4afeb014ce0171c49b4a.pdf
    • https://static.usrfiles.com/ugd/b8c837_6bcb1f5a65bf4a72a1e90f841602bdbd.pdf
    • https://static.usrfiles.com/ugd/b8c837_767516d29e734ebca158c269edd07f9c.pdf
    • https://static.usrfiles.com/ugd/40b9e6_5d6ddc2b2b314efaae09a5742d3878b3.pdf
    • https://cdn.shopify.com/s/files/1/0435/8776/4387/files/52474904536.pdf
    • https://cdn.shopify.com/s/files/1/0438/3758/7606/files/ranoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0412/4571/files/la_reine_margot_1954.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_off00006f24.bin
bd658437e62b29f02e0d106b16255a330846230fe3c894223c29f6a176de13a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F24 5244 bytes
font_01_sfnt_off0000810a.bin
f2e3249ccf16cf49b970b90dbd9fa53b0b38da3eee03eb436dc5bd27edce03b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x810A 10832 bytes

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