Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d44fa96ca6a031…

MALICIOUS

PDF

50.5 KB Created: 2020-07-23 04:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0cb62beb9bf954bfdd568367f588d86 SHA-1: c5e8a6673bd812c5ec3192fca888d9485f0b2add SHA-256: 67d44fa96ca6a031e46f524e4fb6f07429c87abfb2cceddc894da3046ee943d6
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to a malicious site. The document also features a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score strongly suggest malicious intent.

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.cc/wb?keyword=vanquish%20magazine%20pdf%20free%20download
    • http://files.skidmorecounseling.com/uploads/1/3/0/7/130776368/daee8b4b.pdf
    • http://files.abrahamsbox.com/uploads/1/3/1/6/131637365/d33520fd0a14c79.pdf
    • http://files.barkingwithbutler.com/uploads/1/3/0/7/130739826/6fbf3f.pdf
    • http://files.weilongzhang.com/uploads/1/3/1/6/131637242/2a435d7fdb43a.pdf
    • http://files.electroniccottage.org/uploads/1/3/0/8/130813643/f037fdbf571.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5376/0162/files/24014232283.pdf
    • https://cdn.shopify.com/s/files/1/0434/3355/8168/files/nudumivibufijewubuxitapaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/1279/2225/files/73284366472.pdf
    • https://burokufatali.files.wordpress.com/2020/07/84235739060.pdf
    • https://xilawirusit.files.wordpress.com/2020/06/sikufurosibinisixoxujoru.pdf
    • https://bamajakemopi.files.wordpress.com/2020/06/jigimeno.pdf
    • https://kudikinojov.files.wordpress.com/2020/06/lusedufutumexetew.pdf
    • https://cdn.shopify.com/s/files/1/0432/5569/3470/files/rafitesuwub.pdf
    • https://cdn.shopify.com/s/files/1/0433/0710/6462/files/28801074146.pdf
    • https://cdn.shopify.com/s/files/1/0432/7122/5502/files/39730369589.pdf
    • https://cdn.shopify.com/s/files/1/0429/8883/0873/files/lezikenubek.pdf
    • https://cdn.shopify.com/s/files/1/0430/5344/9367/files/62022995234.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/95909873105.pdf
    • https://cdn.shopify.com/s/files/1/0427/7701/8524/files/19267614373.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_off0000794e.bin
eb729860d79dd21e0995c5f3eac94b49f52308899f346bc6755e1f8f3db6a0e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x794E 5488 bytes
font_01_sfnt_off00008bd6.bin
ee07c57f55bbf393a13c6d94376df6451ce33a2f2cf9bfc2c94e499aa6737007		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD6 15236 bytes

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