Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd30953c486e9e01…

MALICIOUS

PDF

45.3 KB Created: 2020-08-31 20:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd78d5698b2529554311f9413ee7f697 SHA-1: a1f4708c10d9947cc9c7b2bc2a3d5ce9bef09518 SHA-256: bd30953c486e9e018ed6205d16351e49a5259079aed82a683a502102d0bb9775
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely intended to lead the user to a malicious payload. The document body, though heavily obfuscated, contains the URL and a keyword suggesting a lure. The presence of numerous links to static.usrfiles.com, while marked as benign, indicates a link farm strategy. 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.cc/wix?keyword=cooling+tower+manual+cti+pdf
    • https://static.usrfiles.com/ugd/67e251_6e630c26886d45b0ae4524674324840b.pdf
    • https://static.usrfiles.com/ugd/b8c837_023c3f9e750b484f8a16210357773a9f.pdf
    • https://static.usrfiles.com/ugd/0f5b72_e9e2868eb3dd4fa88f98c9c5377a2d06.pdf
    • https://static.usrfiles.com/ugd/b8c837_3a64805a9df64764bac754b31f1b0bff.pdf
    • https://static.usrfiles.com/ugd/a2c2bc_0c411bac6d26422eaffc4c04e8614a24.pdf
    • https://static.usrfiles.com/ugd/b8c837_7d3828c3883540ddbb5ef89150653f33.pdf
    • https://static.usrfiles.com/ugd/b8c837_db3253c0efc7482b895a918465f5b309.pdf
    • https://static.usrfiles.com/ugd/d2cc1f_f28d80f43cc34d5f966cff1ebc744657.pdf
    • https://static.usrfiles.com/ugd/b8c837_06db17e6207a4202b155e66128dde9ea.pdf
    • https://static.usrfiles.com/ugd/b8c837_687d5e1acddd42a4a569c6aba716f1fb.pdf
    • https://cdn.shopify.com/s/files/1/0433/4950/8250/files/18534293937.pdf
    • https://cdn.shopify.com/s/files/1/0430/0200/3609/files/o_corvo_edgar_allan_poe_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/3644/1767/files/pepebuluza.pdf
    • https://cdn.shopify.com/s/files/1/0449/7804/5096/files/passive_voice_present_past_simple_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0434/6295/1074/files/pudogobekinelison.pdf
    • https://cdn.shopify.com/s/files/1/0428/8079/4780/files/arsenal_vs_chelsea_highlights_today.pdf
    • https://cdn.shopify.com/s/files/1/0433/2870/0571/files/encyclopdie_visuelle_des_plantes_sauvages.pdf
    • https://cdn.shopify.com/s/files/1/0430/2562/9335/files/detur.pdf
    • https://cdn.shopify.com/s/files/1/0429/1998/5319/files/loxeremagafetul.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_off00007112.bin
a2fffc4db77ae407ada7c04907f182594d01e3de18da140cd1e965b397515ed0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7112 5292 bytes
font_01_sfnt_off0000830b.bin
a97e46deaf703a36d401fef55f2375405cfd81c882a50a3f3d9933ca62e2ccb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x830B 10852 bytes

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