Malicious PDF — malware analysis report

Static analysis result for SHA-256 f703ea0748934511…

MALICIOUS

PDF

40.9 KB Created: 2020-08-09 04:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0dda12e6ae9c7c8f9204f191700fea59 SHA-1: 1aef83ba98f3530ad4cff51d5373f7579cc24656 SHA-256: f703ea07489345116186df0bce16331d378f55202c13b839dc2ffb6ca3ae98db
152 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 but ultimately redirect to a known malicious URL (https://ttraff.cc/pify?keyword=basics+cctv+system+pdf). This indicates a link farm or redirection scheme designed to lead users to malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=basics+cctv+system+pdf
    • http://files.broadwingadventures.com/uploads/1/3/0/7/130739343/5306559.pdf
    • http://files.mynextbike.com/uploads/1/3/1/0/131069915/pamijedado.pdf
    • http://files.sansmarket.co/uploads/1/3/0/9/130969377/288917.pdf
    • https://cdn.shopify.com/s/files/1/0430/5672/6170/files/pemogidusovegugeneku.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4967/files/vewesasusu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3826/8830/files/56345820192.pdf
    • https://cdn.shopify.com/s/files/1/0430/0003/7527/files/90649247120.pdf
    • https://cdn.shopify.com/s/files/1/0433/8201/4108/files/zefazaxufotulapu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8376/7713/files/epa_609_certification.pdf
    • https://cdn.shopify.com/s/files/1/0430/6203/4589/files/kaiser_mission_statement.pdf
    • https://cdn.shopify.com/s/files/1/0430/3365/7495/files/xipibirazuxuz.pdf
    • https://cdn.shopify.com/s/files/1/0439/3772/6622/files/overhead_door_rsx_installation_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/3188/8021/files/84898602707.pdf
    • https://cdn.shopify.com/s/files/1/0427/7154/6279/files/49661324564.pdf
    • https://cdn.shopify.com/s/files/1/0432/5461/2123/files/rewobolawabaveso.pdf
    • https://cdn.shopify.com/s/files/1/0433/0625/4494/files/72146106711.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_off0000635f.bin
708533975f12c6ccdad6a1bb5369dae375a8ab743114ed75a0a8418e0f29326e
pdf-font-stream PDF embedded font (sfnt) at offset 0x635F 5384 bytes
font_01_sfnt_off000075b2.bin
85b345461668f2bfe3e631144f51f159b46d24a8cee3b6ed659f4f8966cbc41a
pdf-font-stream PDF embedded font (sfnt) at offset 0x75B2 9784 bytes