Malicious PDF — malware analysis report

Static analysis result for SHA-256 10201b017a7c03d4…

MALICIOUS

PDF

46.9 KB Created: 2020-08-06 17:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69b5b2ba91113696fd7840999815fa00 SHA-1: af074868392e596448e6a1cc00fa76af61c607c8 SHA-256: 10201b017a7c03d467d9b26fb721a964fac69b5f281eaba7171194c39b97f994
162 Risk Score

Malware Insights

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

This PDF document contains a malicious redirector link disguised as a calendar download. The primary link, https://ttraff.cc/wb?keyword=ttd%20calendar%202020%20pdf%20tirumala, is flagged as malicious. Additionally, the document contains a large number of external PDF links, many hosted on Shopify, which is characteristic of SEO link farm abuse. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=ttd%20calendar%202020%20pdf%20tirumala
    • http://valeri.sacicc.org/uploads/1/3/1/4/131407005/teverapozimew-jisejaziduvozop-nusamesurujikim.pdf
    • http://files.pandlexpressinc.com/uploads/1/3/1/4/131438641/45a60b81b51ed4.pdf
    • http://files.typebtriathlete.com/uploads/1/3/1/4/131436978/xuruxinubeme.pdf
    • http://files.cherryhurstcivic.org/uploads/1/3/1/4/131452904/c7dc628.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21884581804.pdf
    • https://cdn.shopify.com/s/files/1/0429/0225/7823/files/59286910844.pdf
    • https://cdn.shopify.com/s/files/1/0437/4839/3112/files/90094196365.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5085/files/ccna_cisco_certified_network_associate_study_guide_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/2794/5889/files/ibm_aix_certification_dumps.pdf
    • https://cdn.shopify.com/s/files/1/0434/5757/7122/files/zaruzikumex.pdf
    • https://cdn.shopify.com/s/files/1/0431/1177/6416/files/1141827260.pdf
    • https://cdn.shopify.com/s/files/1/0433/5294/8901/files/onkyo_firmware_update.pdf
    • https://cdn.shopify.com/s/files/1/0431/9445/0078/files/72058093465.pdf
    • https://cdn.shopify.com/s/files/1/0439/2468/4955/files/alvaro_gomez_hurtado_la_revolucion_en_america.pdf
    • https://cdn.shopify.com/s/files/1/0429/4888/6684/files/57067667705.pdf
    • https://cdn.shopify.com/s/files/1/0430/2592/4249/files/sazakizizopipedumo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6197/6994/files/4301475990.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tosinumemelijigejidab.pdf
    • https://cdn.shopify.com/s/files/1/0437/5930/4865/files/odysseyware_geometry_semester_2_answers.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_off00006cd3.bin
165558c6e803a6d67d77e826962d2c1ae5ddd200ef7e1903297430d19eefe664		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD3 5348 bytes
font_01_sfnt_off00007ee8.bin
bf462aeac9bd6f3c69d96eb7bcda3f20e5328195243cb507eccc846be2d6aee2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EE8 15344 bytes

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