Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba82bf13db1a5f20…

MALICIOUS

PDF

40.0 KB Created: 2020-08-21 03:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4acf5de61fbab29adc0090b1e36f4bbd SHA-1: f1b0c15d73c8acb717e6decc2b661b2b40b00c00 SHA-256: ba82bf13db1a5f207a0ecbc09c3e9e2580ef18c5b1b389db3539c128869e1a5d
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting PDF files, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is presented with a keyword related to calculating pay. This indicates a social engineering attempt to trick the user into clicking the link, likely to a phishing or malware distribution site. No scripts were extracted, and the document body is heavily obfuscated.

Heuristics 3

  • 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.
  • 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=calculating+gross+pay+with+overtime+worksheet
    • http://files.colonialridgegolf.com/uploads/1/3/1/4/131438419/7861758.pdf
    • http://files.ecologicing.com/uploads/1/3/1/6/131607374/5740231.pdf
    • http://files.k9workinglinegsdvonbennett.com/uploads/1/3/1/4/131406885/xuzerelidoj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71895612735.pdf
    • https://cdn.shopify.com/s/files/1/0435/9792/2461/files/bunufiwiritululavujaduk.pdf
    • https://cdn.shopify.com/s/files/1/0438/3136/1686/files/naming_alkanes_and_alkenes.pdf
    • https://cdn.shopify.com/s/files/1/0431/1685/5453/files/definicion_de_diabetes_mellitus_tipo_2_segun_la_oms.pdf
    • https://cdn.shopify.com/s/files/1/0439/7717/9294/files/gabumoxubawibafafivako.pdf
    • https://cdn.shopify.com/s/files/1/0435/2793/0011/files/64160920339.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/pedodorisedarefexu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9911/1070/files/32150403802.pdf
    • https://cdn.shopify.com/s/files/1/0432/1129/2827/files/lightroom_app_free_for_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0428/6509/8908/files/584261410.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005da3.bin
100dbdd7f1a465cdfff98d4dcdb0641a72cf61e3a9faca38600284429f4add56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DA3 5572 bytes
font_01_sfnt_off0000707f.bin
04e36067babffebb9da8ecb920812e5bb07d57183caa35d9fb37097bbb06cb9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x707F 10192 bytes

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