Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2536e39f60790d7…

MALICIOUS

PDF

41.3 KB Created: 2020-08-24 00:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d74794823126d1998382dbe77df4ebc9 SHA-1: 20503eec984332bb54f3d5de1283f267a285f157 SHA-256: a2536e39f60790d76745bada66505595426351f164a77975be976660cb4e53e3
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with a critical heuristic firing indicating a malicious redirector link. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=free+piano+sheet+music+catholic+hymns, which is likely used to redirect users to a malicious site. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning technique to distribute the malicious content.

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=free+piano+sheet+music+catholic+hymns
    • http://files.m-residencesforsale.com/uploads/1/3/0/8/130873943/52736f7521a.pdf
    • http://befemana.extremeneedlepiercing.co.uk/uploads/1/3/1/4/131437709/wudojokekim.pdf
    • http://files.lakeeriewalleyecandy.com/uploads/1/3/1/8/131857304/xemex-rarujekawo-voxux-monilolumir.pdf
    • https://cdn.shopify.com/s/files/1/0438/7900/6376/files/98225174305.pdf
    • https://cdn.shopify.com/s/files/1/0429/8267/0485/files/23058152247.pdf
    • https://cdn.shopify.com/s/files/1/0435/5820/7651/files/boosie_no_juice_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/5481/7690/files/ketexegojubumilitedazebi.pdf
    • https://cdn.shopify.com/s/files/1/0449/2810/6651/files/critical_care_transport_core_curriculum.pdf
    • https://cdn.shopify.com/s/files/1/0431/3205/9810/files/zetanufexorejadetaberuma.pdf
    • https://cdn.shopify.com/s/files/1/0435/6043/5871/files/42714733071.pdf
    • https://cdn.shopify.com/s/files/1/0430/2091/0746/files/diagram_of_the_lungs_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/0688/5027/files/zaterudejibogexurero.pdf
    • https://cdn.shopify.com/s/files/1/0435/9271/2349/files/bbc_learning_english.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/astrology_kundali_app.pdf
    • https://cdn.shopify.com/s/files/1/0428/3518/1734/files/g._dragon_crooked_lyrics.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_off00006230.bin
12db7f2efabb4308bd229a62eaaf83e63387a095d553fe0042d92a606b7bc8de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6230 5228 bytes
font_01_sfnt_off000073ce.bin
6ec091726766bd9ccdd40b9e8ff61d7babe67645278421d32658f14cf70a5293		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73CE 10504 bytes

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