Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c276e6115c735c9…

MALICIOUS

PDF

51.5 KB Created: 2020-09-04 04:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 763b3e380e2231a222667bb9df9b130c SHA-1: 24462d4c3d4a834f0bf124602c7a350dfbbcb07f SHA-256: 6c276e6115c735c91f3aa154186c369b563be66deaaa5dd54355f12683bd2cd9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded URLs, one of which, 'https://ttraff.me/wix?keyword=linear+function+word+problems+worksheet+doc', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and appears to be a lure related to educational content. The presence of numerous benign-looking PDF links suggests a link farm used to obscure the malicious redirector. The ML classifier strongly indicates maliciousness.

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.me/wix?keyword=linear+function+word+problems+worksheet+doc
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/4894/4284/files/xudalabakurebolefafepurit.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/kawevinej.pdf
    • https://cdn.shopify.com/s/files/1/0432/5159/7480/files/27478530033.pdf
    • https://cdn.shopify.com/s/files/1/0429/8945/3473/files/49938962479.pdf
    • https://cdn.shopify.com/s/files/1/0429/6556/5589/files/jeremy_bentham_utilitarianism.pdf
    • https://cdn.shopify.com/s/files/1/0462/3961/3079/files/vexiparunepevekuparirev.pdf
    • https://cdn.shopify.com/s/files/1/0438/0118/2369/files/gobeserugifuselegaxaxotix.pdf
    • https://cdn.shopify.com/s/files/1/0435/3314/0127/files/vifoxivebur.pdf
    • https://cdn.shopify.com/s/files/1/0430/6255/8874/files/99680346959.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1149/files/vekodusu.pdf
    • https://static.usrfiles.com/ugd/40b9e6_c08eca8143ba44d28797540a883d698f.pdf
    • https://static.usrfiles.com/ugd/40336e_398b8cfe0f4447999d7693866f8b1aa6.pdf
    • https://static.usrfiles.com/ugd/e8e253_76026ba4470d4ac3bfbf0caf5d24eed9.pdf
    • https://static.usrfiles.com/ugd/97368a_15e92cca0aa4428d80caf4b9b6fd3f82.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vewurobafug.pdf
    • https://cdn.shopify.com/s/files/1/0462/6618/7933/files/40583869040.pdf
    • https://cdn.shopify.com/s/files/1/0435/7334/6472/files/70228799303.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000085b1.bin
797571e2d942535a97e997561dbf8a7fd0c4e415e5094aa612efc77e69b83c65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85B1 5632 bytes
font_01_sfnt_off000098c3.bin
783251438d4096378cc571b5e4815c22b987e15f431a7901314011d2aa005b38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98C3 12492 bytes

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