Malicious PDF — malware analysis report

Static analysis result for SHA-256 997d63e29c8ec53c…

MALICIOUS

PDF

35.4 KB Created: 2020-09-04 00:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d26f89f021fa7fe20c1f5f5b955ff93 SHA-1: 3977cf9a4cfda869036d932e495079c9e7407242 SHA-256: 997d63e29c8ec53cb0b2e3e553a1d5567aa4f3668ce94a6c8b816f60d6119a2e
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, many of which point to a redirector service. The document body, though heavily obfuscated, contains text that appears to be a lure for movie downloads, specifically mentioning 'Aarakshan movie 300mb khatrimaza'. The primary heuristic firing indicates the PDF links to known malicious redirector infrastructure, and the ML classifier strongly supports maliciousness. The intent appears to be to drive traffic to malicious sites under the guise of providing download links.

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/pify?keyword=aarakshan+movie++300mb+khatrimaza
    • https://static.usrfiles.com/ugd/af0aa9_a5354d4cee5541fda7caab262a800690.pdf
    • https://static.usrfiles.com/ugd/2072cd_c33dab5f75254b009ce10f9f831cf3bd.pdf
    • https://static.usrfiles.com/ugd/c3548c_4d5d7c4bbb7448c48319da1e6fad949c.pdf
    • https://cdn.shopify.com/s/files/1/0436/4884/3929/files/garikupizobup.pdf
    • https://cdn.shopify.com/s/files/1/0432/3776/9384/files/rovuw.pdf
    • https://cdn.shopify.com/s/files/1/0436/9963/4328/files/gamakiwigol.pdf
    • https://cdn.shopify.com/s/files/1/0435/5286/6463/files/acnl_gulliver_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/7837/6853/files/93697879243.pdf
    • https://cdn.shopify.com/s/files/1/0438/1619/0112/files/minecraft_team_extreme_launcher_cracked.pdf
    • https://cdn.shopify.com/s/files/1/0438/2644/6496/files/tuxizakibuvefobemarugowe.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_off0000493f.bin
775bdf19ded48c271a8063f095e0fd2ecf2c2bfb8c07480e9f6e5261b618f2e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x493F 5500 bytes
font_01_sfnt_off00005bd7.bin
56521bda2c66a3a5b3613c98d245b243fb04a2ec92947a6880ff82e0bf221927		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD7 10984 bytes

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