Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cdf4fa3f99a1a0f…

MALICIOUS

PDF

38.6 KB Created: 2020-08-23 08:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6917b25420dff8aab374ec2fd96801d SHA-1: a1f5e9e9c3801b2ab6636b2ae64e27edb25f064b SHA-256: 6cdf4fa3f99a1a0fe7e6f883715493d9734b96688d4ed460f65ea716965a75cc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO poisoning tactic. One of the primary links directs to a known malicious redirector, indicating an attempt to lead the user to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.ru/pify?keyword=healthy+eating+pyramid+worksheets+australia
    • http://files.charmingfarminggoats.org/uploads/1/3/0/7/130775652/2f5ccf0.pdf
    • http://files.rivermethodistchurch.org.uk/uploads/1/3/1/3/131384468/53aca55ac2.pdf
    • http://files.warrandytecalisthenics.com/uploads/1/3/1/4/131453387/bumaledinawadug-davadaden-minexozisa.pdf
    • http://jatifiv.instep360.org/uploads/1/3/0/9/130968984/67de5c3f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6231/2616/files/jenedikanufifewosom.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0747/files/bevogixokakibebusute.pdf
    • https://cdn.shopify.com/s/files/1/0432/4281/5643/files/26762140263.pdf
    • https://cdn.shopify.com/s/files/1/0435/2894/5819/files/cisco_jabber_12._1_mac.pdf
    • https://cdn.shopify.com/s/files/1/0431/6073/1803/files/gofijobajepawu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1682/2692/files/15690789284.pdf
    • https://cdn.shopify.com/s/files/1/0432/0264/2075/files/95732290963.pdf
    • https://cdn.shopify.com/s/files/1/0431/0610/7552/files/amadeus_altea_dcs.pdf
    • https://cdn.shopify.com/s/files/1/0437/6713/6408/files/jabariya_jodi_full_movie_watch_online.pdf
    • https://cdn.shopify.com/s/files/1/0430/0088/9507/files/java_swing_and_awt_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0438/0554/0509/files/48489830099.pdf
    • https://cdn.shopify.com/s/files/1/0432/5851/1510/files/broaching_machine_operation.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_off000057af.bin
6786b3525316c6aa2343451cbcaf5c8b65e0f05873f97640a4a5460150f338b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57AF 5592 bytes
font_01_sfnt_off00006a93.bin
6302af68adab89a95fadc78f6a86f4461e4a1d277414432628b9d8830772898a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A93 10136 bytes

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