Malicious PDF — malware analysis report

Static analysis result for SHA-256 605c46bdc85b1f02…

MALICIOUS

PDF

41.5 KB Created: 2020-09-05 23:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fa7a928e84c3f94a1926b9613653fd5 SHA-1: 36c7c1c40b987308b98a09065407b43bb2d2d065 SHA-256: 605c46bdc85b1f02623c96e41ad508cbfde8e9f7e9fb8bd6d749f711104248a0
162 Risk Score

Malware Insights

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

The PDF contains a large number of links to external PDFs, many of which appear to be SEO-generated content. One of the embedded links, 'https://ttraff.club/wix?keyword=finding+slope+of+a+line+worksheet', is flagged as a known malicious redirector. The presence of a 'download button' lure further suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.club/wix?keyword=finding+slope+of+a+line+worksheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_00746bb3e7cd49f19d7059be2d01271d.pdf
    • https://static.usrfiles.com/ugd/6cfc61_1332c3b8e1ea491f81efa1dc79fb95da.pdf
    • https://static.usrfiles.com/ugd/40336e_18b4f9fd7c9b4bc5b450e84fb07468f0.pdf
    • https://cdn.shopify.com/s/files/1/0431/7341/3028/files/davumoganibemaxivedego.pdf
    • https://cdn.shopify.com/s/files/1/0434/0541/0471/files/wadafufadidegabogetez.pdf
    • https://static.usrfiles.com/ugd/724bd4_c94b196e622c4e679c1776ce04de37d7.pdf
    • https://static.usrfiles.com/ugd/361f4b_9ce24a8da77b46939b694f9daf7e86c6.pdf
    • https://static.usrfiles.com/ugd/f96b02_8e2f91371a9d4ce9af37d5b1f7ce7f6c.pdf
    • https://cdn.shopify.com/s/files/1/0435/9431/7981/files/xujogomumuredarazexesi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8316/9943/files/jusikol.pdf
    • https://cdn.shopify.com/s/files/1/0430/1540/5725/files/56390015099.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_off00005c8c.bin
ecfad2a57e9a168555d9222e879757f45b90101e7d95526f2d763b597804a9f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C8C 5412 bytes
font_01_sfnt_off00006f09.bin
fbe4a4da531578b3ecc5039192e592be6eb2f4d4b360d472a4350245899ffbbe
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F09 13688 bytes