Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b9fc039911ac78…

MALICIOUS

PDF

57.6 KB Created: 2020-09-04 00:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd1e31422e96da58d22c1f517eeeb3bc SHA-1: 6d3b3cb77e966a3fe4a13ccd91291793f46e8ea9 SHA-256: 44b9fc039911ac78978fcde5f6b9b15cac5499d541ee7d3417d35dba562f8805
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to 'biotechnology in food processing'. The presence of numerous external PDF links, many hosted on static.usrfiles.com, indicates a link farm strategy. The ML classifier also 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.link/wix?keyword=role+of+biotechnology+in+food+processing+pdf
    • https://static.usrfiles.com/ugd/99afdc_3098816f276641b88befb0b13a37e54a.pdf
    • https://static.usrfiles.com/ugd/22bf55_9cef3f7c4acc4ab18a19af2fc8470806.pdf
    • https://static.usrfiles.com/ugd/1d5a3f_22879334dcda4e9dbe2279d148e351d4.pdf
    • https://static.usrfiles.com/ugd/aec2ea_06b64378efaa43d8966a3523cddbc126.pdf
    • https://static.usrfiles.com/ugd/4dded2_569afa12446b4994bcd1b1d295357da3.pdf
    • https://cdn.shopify.com/s/files/1/0431/2127/9138/files/jurosoxixixoguxurivamo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87899810879.pdf
    • https://cdn.shopify.com/s/files/1/0431/8180/1629/files/56909544601.pdf
    • https://cdn.shopify.com/s/files/1/0438/4253/5581/files/wewikogafopopuwefisa.pdf
    • https://cdn.shopify.com/s/files/1/0447/3444/7770/files/belajar_photoshop_bahasa_indonesia.pdf
    • https://static.usrfiles.com/ugd/6203b9_791ef5feb1734543af75cec8c1e3d686.pdf
    • https://static.usrfiles.com/ugd/b8c837_06c94ce8b47e43228f51319a208a66f1.pdf
    • https://static.usrfiles.com/ugd/20d83a_52419169c6d045f39f167881d669d018.pdf
    • https://static.usrfiles.com/ugd/6a7407_fb088939c353482fabb499e27392d748.pdf
    • https://static.usrfiles.com/ugd/b8c837_335e42b09e474ea6aae944e6a41eac6f.pdf
    • https://static.usrfiles.com/ugd/b8c837_8ab783d66b624c129b02028b7d30d5db.pdf
    • https://static.usrfiles.com/ugd/a891c0_1794d335c81e4ac4aee630514b66fadb.pdf
    • https://static.usrfiles.com/ugd/ea9bdf_58c8df45b1364aa7aa367145b505da47.pdf
    • https://static.usrfiles.com/ugd/2eedf1_87230729318143398ec7eced9ae0c46c.pdf
    • https://static.usrfiles.com/ugd/7e84b7_043b78ab2f5547b599426a4bfa713c66.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000094a9.bin
f0d98e1a83ec8d322c12e2ec2df815838dbb22c09ded91253e81d3ed48441e3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94A9 5244 bytes
font_01_sfnt_off0000a67c.bin
16da88e957435684d16fd1a8f48a0a15010c0b7c545c8d7a8fbf956682a08b53		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA67C 10484 bytes
font_02_sfnt_off0000ca32.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA32 4324 bytes

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