Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab331be72334a3f9…

MALICIOUS

PDF

45.3 KB Created: 2020-08-31 17:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26a1d930a11c9ccc06a1103f069780e3 SHA-1: 8ca97f88f1842d4dd2490a70c888852db3025c89 SHA-256: ab331be72334a3f903ef5e099dcba6c3b36eb9a46ab358bcfd69a079aef4541c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

This PDF document contains a large number of external links, many of which point to a link farm hosted on static.usrfiles.com. One prominent link, https://ttraff.com/wix?keyword=florida+civic+literacy+test+answers, is identified as a malicious redirector. The document's content, though garbled, appears to be related to 'Florida civic literacy test answers', suggesting a lure to trick users into clicking the malicious link. The ML classifier strongly supports the malicious verdict.

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/wix?keyword=florida+civic+literacy+test+answers
    • https://static.usrfiles.com/ugd/e5a943_0d8634f9d0554f4f8395a573bc596d88.pdf
    • https://static.usrfiles.com/ugd/02beb7_ffffe1b479df4df08e456385625b9310.pdf
    • https://static.usrfiles.com/ugd/b8c837_255247082a2043cfad4a63756a91029a.pdf
    • https://static.usrfiles.com/ugd/32777b_c5e249a392ac4e23a98336716241c671.pdf
    • https://cdn.shopify.com/s/files/1/0429/1906/7815/files/fijegowurivib.pdf
    • https://cdn.shopify.com/s/files/1/0431/4628/1121/files/mowejiw.pdf
    • https://static.usrfiles.com/ugd/6c032c_25414590305343068a0372aedbeea696.pdf
    • https://static.usrfiles.com/ugd/d162e3_13aff1ebb940486f9fbfc324dec5cf7e.pdf
    • https://static.usrfiles.com/ugd/b8c837_f7611be48a7a4df19e2892168bd938e0.pdf
    • https://static.usrfiles.com/ugd/fb83f1_a0f39866764248fdbfb33db9cd42b580.pdf
    • https://static.usrfiles.com/ugd/cec570_8f74362297a645798c894c9e5553b836.pdf
    • https://static.usrfiles.com/ugd/b8c837_90ef7077c26f44208d40ebf7a02028cd.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f6e7560c76046b39e6c2e43fc9f667f.pdf
    • https://static.usrfiles.com/ugd/45e30f_fbb51650d6114993bb026a65bd33c2da.pdf
    • https://static.usrfiles.com/ugd/756799_150992ed334b49c8aa7c66d6f176ca62.pdf
    • https://static.usrfiles.com/ugd/b48b60_cdf564fc73844622a01f065763f6dc67.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_off000064d9.bin
2bd2238f3eb23fd53b9dbc20555a4fd4ae8da6b9cf51fa1151c368d0e6c1f540		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64D9 4928 bytes
font_01_sfnt_off000075be.bin
810f738413b4547cc16449a804f6eeec49f6bf5537f355100229ab448f8ed6ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75BE 10756 bytes
font_02_sfnt_off00009a45.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A45 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.