Malicious PDF — malware analysis report

Static analysis result for SHA-256 cabecbcea040c43b…

MALICIOUS

PDF

55.8 KB Created: 2020-08-06 17:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21c812f1674511b28dcae22e87590975 SHA-1: 04ecd5b542c1aa791f0c2fe619aa88dbae94023f SHA-256: cabecbcea040c43b988fe9800b96a705eec8d9915f394ade8bee419ee76c1ea4
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though partially corrupted, contains text related to 'income tax' and a URL pointing to a redirector, suggesting a phishing or malware delivery attempt. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack vector appears to be the malicious redirection link.

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=income%20tax%20slab%20for%20ay%202019%2020%20pdf%20taxmann
    • http://files.salvadors.cn/uploads/1/3/0/8/130813757/60e1aecde3.pdf
    • http://files.meaghanherstad.com/uploads/1/3/0/8/130873728/vunisijowozesos-wadiwupet.pdf
    • http://files.glowbirthsandbabies.co.uk/uploads/1/3/1/3/131378852/3745969.pdf
    • https://cdn.shopify.com/s/files/1/0433/0999/0043/files/doh_anti_smoking_campaign.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/32010840710.pdf
    • https://cdn.shopify.com/s/files/1/0434/5928/1048/files/fedapesumatoloje.pdf
    • https://cdn.shopify.com/s/files/1/0433/1690/4104/files/fufakiwo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92283418618.pdf
    • https://cdn.shopify.com/s/files/1/0437/5881/3341/files/bulk_up_workout_plan.pdf
    • https://cdn.shopify.com/s/files/1/0431/1855/9389/files/86608439655.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37638787324.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jonexosorovofevovu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5720/9753/files/herbs_and_spices_list.pdf
    • https://cdn.shopify.com/s/files/1/0439/9942/8766/files/capture_picture_without_camera_preview.pdf
    • https://cdn.shopify.com/s/files/1/0431/6394/3074/files/82293713048.pdf
    • https://cdn.shopify.com/s/files/1/0432/8541/4056/files/kisalopibefu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ce8.bin
2a50cebd72785955c74711bea04317a3003177fa00b856e136fa3c7f8eafcecb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CE8 6032 bytes
font_01_sfnt_off0000915d.bin
95290c803c3eadedf02d4c2e439c9a58f90264b855f6fb17e9b5d1ed7ec038d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x915D 13476 bytes
font_02_sfnt_off0000bc2e.bin
6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC2E 16164 bytes

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