Malicious PDF — malware analysis report

Static analysis result for SHA-256 88740ed2473df251…

MALICIOUS

PDF

44.5 KB Created: 2020-07-16 03:13:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc7aa433c73b1b480506c73722bd40d9 SHA-1: f3af12ef0bc8af388ad4059a8024fe8f91b51abd SHA-256: 88740ed2473df2512d56e35581e110bc0ec08858e14a17ba11a86cbcc802bd4f
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on Shopify. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the presence of a malicious redirector suggests an attempt to lead the user to a malicious site, likely for phishing or malware distribution.

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/wb?keyword=frequency%20modulation%20circuit%20design%20pdf
    • http://files.tennisjoopbroens.com/uploads/1/3/0/9/130969254/4301331.pdf
    • http://files.stjohnstuckahoe.com/uploads/1/3/1/8/131856877/jegepowopamigek_dunoju_wamemi.pdf
    • http://files.queencharlottetrackwalks.com/uploads/1/3/1/4/131452794/bedogilenilolenejase.pdf
    • http://files.homescooleducation.com/uploads/1/3/0/8/130815095/mosuxiwefa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/7947/6134/files/43453634095.pdf
    • https://cdn.shopify.com/s/files/1/0429/1824/8601/files/1412538242.pdf
    • https://cdn.shopify.com/s/files/1/0435/8638/8136/files/55338094984.pdf
    • https://cdn.shopify.com/s/files/1/0431/3006/0955/files/90983217601.pdf
    • https://cdn.shopify.com/s/files/1/0430/1019/5605/files/raxojesoxapoluf.pdf
    • https://forakij.files.wordpress.com/2020/07/kikesixiliviwomalodob.pdf
    • https://repofuj.files.wordpress.com/2020/07/96261970309.pdf
    • https://tesukejiget.files.wordpress.com/2020/06/fifazupiduzi.pdf
    • https://waxitafoki.files.wordpress.com/2020/07/24449501082.pdf
    • https://cdn.shopify.com/s/files/1/0431/6528/6566/files/43563551182.pdf
    • https://cdn.shopify.com/s/files/1/0432/0142/9662/files/ripow.pdf
    • https://cdn.shopify.com/s/files/1/0437/7670/4664/files/13712010415.pdf
    • https://cdn.shopify.com/s/files/1/0428/1230/9671/files/megikaxewonagafosavo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5632/3995/files/67699316504.pdf
    • https://cdn.shopify.com/s/files/1/0429/8578/3455/files/juxosu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70945418412.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_off00006ff4.bin
e2d4e9aa61ab462858da82bd9c73d56605173af6ea35b34d2c367fe9b1127564		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF4 5540 bytes
font_01_sfnt_off000082b3.bin
4c80aecc30741b6a85a9eb35911dcacdf624058731a38a13d9d48abc6df63ef9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82B3 9936 bytes

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