Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc5e2603c41b257…

MALICIOUS

PDF

49.1 KB Created: 2020-08-26 18:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df04fef202bd6cfdf88dc27398e98d57 SHA-1: 9f6653cf9bc89ab32c05e4ddffdb426be5275fd9 SHA-256: ebc5e2603c41b25777e77f484d8a6c2c94e3af5ee5d223ec74fa78791b4e3ec1
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources. One critical heuristic firing indicates a PDF link to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=uniden+dect+6.0+1580+user+manual'. The presence of a large number of external PDF links, many hosted on Shopify, suggests an attempt to manipulate search engine results or distribute content through a seemingly benign platform. The ML classifier also strongly flagged this PDF as malicious.

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=uniden+dect+6.0+1580+user+manual
    • http://files.fbcsnyder.com/uploads/1/3/2/7/132741339/1881639.pdf
    • http://files.voodoocosmetics.org/uploads/1/3/1/4/131453718/puwifisejakawupuwij.pdf
    • http://kotod.lonestarspringers.com/uploads/1/3/1/4/131407082/pexivemukoje.pdf
    • http://kasoru.mmsoul.com/uploads/1/3/2/6/132680835/padebedoneravu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pekuxiwitijumowiviw.pdf
    • https://cdn.shopify.com/s/files/1/0431/4837/8280/files/97533130806.pdf
    • https://cdn.shopify.com/s/files/1/0434/6734/1974/files/79480966533.pdf
    • https://cdn.shopify.com/s/files/1/0427/6027/4087/files/turnover_tax_in_kenya.pdf
    • https://cdn.shopify.com/s/files/1/0432/8813/3787/files/subaru_outback_manual_transmission.pdf
    • https://cdn.shopify.com/s/files/1/0431/8992/8096/files/beginner_english_grammar.pdf
    • https://cdn.shopify.com/s/files/1/0434/0085/5706/files/tudetini.pdf
    • https://cdn.shopify.com/s/files/1/0429/8362/0767/files/x_ray_texture_pack_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0432/7155/3189/files/10_class_date_sheet_2020_up_board_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0625/4494/files/awards_and_honours_2020.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_off00006834.bin
8cdd16ecc43e7a28c17e7de4d13239b3575e33d2a6cc872eb2f2870e016d835f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6834 5544 bytes
font_01_sfnt_off00007afa.bin
bcbdb23c9c5ee6f2b0562a81806f3604a9c8259b320a46eefff63e2e8568acf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AFA 15108 bytes
font_02_sfnt_off0000a994.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA994 4324 bytes

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