Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a55c01390d4cfa7…

MALICIOUS

PDF

68.3 KB Created: 2020-09-08 14:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 030fee507e6f49d3108b19123a58830d SHA-1: f9c92bb664371df69eccbeadaa89cf910ff71cf7 SHA-256: 2a55c01390d4cfa7547e5aee5bbd511733c78af0afd01c45bd9024740c4f68b4
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is related to an 'assignment format word'. This indicates a social engineering attempt to trick the user into visiting a malicious URL, likely for phishing or malware delivery. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=assignment+format+word
    • https://static.usrfiles.com/ugd/e23fbb_cd32a389583c4ede96174f5abd98f39a.pdf
    • https://static.usrfiles.com/ugd/07e02c_7a62150366a24062891567245097f260.pdf
    • https://static.usrfiles.com/ugd/5c139a_a95089031c8a416a8122bd76df9d0f07.pdf
    • https://static.usrfiles.com/ugd/10cedf_876f753623ab4026af193436a25abd33.pdf
    • https://static.usrfiles.com/ugd/943725_bdae890632d84d11bfbc65e0c1b748de.pdf
    • https://static.usrfiles.com/ugd/ce77c6_dd29d24ce75e48579d0d1918389c32f7.pdf
    • https://static.usrfiles.com/ugd/ee4d88_476b5c311bd64ab7b9b9ca77c71e4a5c.pdf
    • https://static.usrfiles.com/ugd/c3f59f_dac552e1e90940b7a71bd56e651e5a9b.pdf
    • https://static.usrfiles.com/ugd/a891c0_1672586739b54e14a75c9d34249a38d3.pdf
    • https://static.usrfiles.com/ugd/1c90dc_881b3e7026d845c68e43ef763da2190d.pdf
    • https://static.usrfiles.com/ugd/04c368_ac978b2ee5b1401c9bea68aed6955237.pdf
    • https://static.usrfiles.com/ugd/bf650e_ee9eac09f28446e2820696f1dec5c77a.pdf
    • https://static.usrfiles.com/ugd/9734e7_acc08aace43c4a748b85388c870e3b9a.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_off0000c527.bin
dd7b880f1c6958317b71933e3175eb4154b1281d355b69180e4ce829e506ee21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC527 2828 bytes
font_01_sfnt_off0000cf21.bin
eee58d6f35466fea371531f3b40dd9a7628e3d90c116292028bf527350df5da8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF21 5276 bytes
font_02_sfnt_off0000e10a.bin
e2ff19848406254954b8c91271c69c934f03b38d1f6769c69060d2bd40bd3b5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE10A 9868 bytes

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