Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c5d011a6bf1071d…

MALICIOUS

PDF

37.9 KB Created: 2020-08-29 15:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c971b00999d19f719426e978e2b6a4d SHA-1: ba70eb1239a619e287a837d112f9be8833fb310d SHA-256: 4c5d011a6bf1071dba3b91f682c001ce45e7968af634f003d4efafd66aa9fe75
154 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One of these links, 'https://ttraff.ru/wix?keyword=tyt+th-8600+service+manual', is identified as a known malicious redirector. The presence of a link farm and a malicious redirector suggests an attempt to lure users to malicious infrastructure, likely for further exploitation or credential harvesting.

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.ru/wix?keyword=tyt+th-8600+service+manual
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/snes_mortal_kombat.pdf
    • https://cdn.shopify.com/s/files/1/0446/7684/1635/files/vopuruseregupujenegomozot.pdf
    • https://cdn.shopify.com/s/files/1/0430/0223/2983/files/37953594857.pdf
    • https://cdn.shopify.com/s/files/1/0438/0976/7584/files/68850099587.pdf
    • https://static.usrfiles.com/ugd/ba3095_2031620e1f7a430f82041d3c7c8238c9.pdf
    • https://static.usrfiles.com/ugd/b8c837_209706d215504ab29609f49a4b032d6d.pdf
    • https://static.usrfiles.com/ugd/b8c837_d50b3c1c2f5f4af4af6a03030937864b.pdf
    • https://static.usrfiles.com/ugd/b8c837_02fc83144f7545f687d0250a539dcb4b.pdf
    • https://cdn.shopify.com/s/files/1/0439/7613/0718/files/nba_basketball_score_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/7839/3762/files/geometry_dash_airborne_robots_song.pdf
    • https://cdn.shopify.com/s/files/1/0432/8770/7812/files/kill_team_2018.pdf
    • https://cdn.shopify.com/s/files/1/0437/0140/3801/files/kinadavuv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51220099535.pdf
    • https://cdn.shopify.com/s/files/1/0432/2135/2606/files/korean_learning_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/2881/4741/files/fotaradegudiwofenexixi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6083/0108/files/battle_net_so_slow.pdf
    • https://cdn.shopify.com/s/files/1/0437/5989/4689/files/84520611591.pdf
    • https://cdn.shopify.com/s/files/1/0433/8571/6886/files/divikisomeg.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_off00005204.bin
5ddb0be31b29858122550495a2a4a2e18f4896988f9e5c4d83ff9bf6e7bec03a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5204 5672 bytes
font_01_sfnt_off00006539.bin
67e715c6ec31dcbae86659c1d3012f5d8f3dae22fb8b3423e3594da81b8acbb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6539 11324 bytes

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