Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ae892a815193ea…

MALICIOUS

PDF

47.0 KB Created: 2020-08-02 01:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0df36e996f753f173de8720c49213edc SHA-1: 18e69c8f7e4e2a34a4a2fcd5b37bbc62e9911af5 SHA-256: 75ae892a815193ea27aa374815d5ae759488540007b7e6a6926f00007d2118e7
162 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, disguised as a download for a technical document. This is further supported by heuristics indicating a malicious redirector link and a link farm, suggesting an attempt to distribute malicious content or engage in SEO abuse. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=electric+machinery+7th+edition+pdf
    • http://files.escaperoomelectronics.com/uploads/1/3/1/6/131606807/bumexupa.pdf
    • http://files.innovaspace.org/uploads/1/3/1/8/131856757/wedadizujamali.pdf
    • http://files.peopleandpipelines.com/uploads/1/3/1/6/131637308/gejakojujox_mapukosibusus_kadowipugafifil.pdf
    • http://files.durhamshowcasefestival.com/uploads/1/3/1/4/131406344/surejoxuvam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1218/4474/files/jajamet.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/16677981821.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/29911371774.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6587/files/kasunekozabutogarakiloze.pdf
    • https://cdn.shopify.com/s/files/1/0432/0201/9487/files/verekaduv.pdf
    • https://cdn.shopify.com/s/files/1/0437/5907/5477/files/97829997304.pdf
    • https://cdn.shopify.com/s/files/1/0428/9911/2095/files/selirixenibogupale.pdf
    • https://cdn.shopify.com/s/files/1/0437/8719/0430/files/gakopadunazibarimexawufi.pdf
    • https://cdn.shopify.com/s/files/1/0427/7898/4614/files/rudafas.pdf
    • https://cdn.shopify.com/s/files/1/0431/4529/8080/files/23103778698.pdf
    • https://cdn.shopify.com/s/files/1/0431/6050/2421/files/zigababafixoti.pdf
    • https://cdn.shopify.com/s/files/1/0432/3983/3763/files/basefanemotuwoguvuta.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_off0000789c.bin
306ba5ac785c7aa929b803b18f86b0452923cab68326e236760605a2b789a2af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x789C 5356 bytes
font_01_sfnt_off00008abc.bin
cc5f74fee16be87340c917fdb07a790f05cc0094be4c5d6568df1b75d7d8159c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ABC 10552 bytes

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