Malicious PDF — malware analysis report

Static analysis result for SHA-256 636318dbd91ce734…

MALICIOUS

PDF

45.1 KB Created: 2020-08-16 14:41:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f98ebdd60eca502caedafacbd5e3417 SHA-1: 699fad5fcb5e931662531b23878b30714d7fab30 SHA-256: 636318dbd91ce734e9260608d07a14316482ad6fed47f1b0ea601912f71e32cb
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains the same URL. The PDF also exhibits characteristics of a link farm, with numerous embedded links pointing to various external PDFs, some of which are hosted on potentially malicious domains.

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/pify?keyword=crossword+jam+answers+greece
    • http://fuwox.decktuneuprapidcity.com/uploads/1/3/0/7/130739625/jutefotudipuvuw.pdf
    • http://files.cincifamilylaw.com/uploads/1/3/0/9/130969065/3db2976a.pdf
    • http://files.soundteaching.ca/uploads/1/3/0/7/130776573/781138eef9835de.pdf
    • http://files.kristindonerstudios.com/uploads/1/3/2/7/132740270/3859757.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/thermoscan_braun_6500_manual_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0431/5552/1695/files/dw_meaning_slang.pdf
    • https://cdn.shopify.com/s/files/1/0435/4048/0164/files/25001058775.pdf
    • https://cdn.shopify.com/s/files/1/0437/5127/6696/files/wazozaxebepiziw.pdf
    • https://cdn.shopify.com/s/files/1/0427/5693/1751/files/lugoxomijotopez.pdf
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/35844489142.pdf
    • https://cdn.shopify.com/s/files/1/0431/7193/8461/files/49176169155.pdf
    • https://cdn.shopify.com/s/files/1/0428/6968/6431/files/47287107282.pdf
    • https://cdn.shopify.com/s/files/1/0433/7513/2824/files/vupodajugitubupo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0664/files/xojipevananukunafenowivub.pdf
    • https://cdn.shopify.com/s/files/1/0437/8047/2984/files/48724606955.pdf
    • https://cdn.shopify.com/s/files/1/0438/5928/0022/files/chemical_bonding_in_inorganic_chemistry.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f90.bin
2c8d3030cc2e28ef1a14c5164fc873d917ebf7db2a5569af2e2fab312c778b26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F90 5076 bytes
font_01_sfnt_off000070c9.bin
93a7d522bb381ccd98b15d9e53f73894493e2d152f3ef509a567be17f8e4a2eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70C9 12984 bytes
font_02_sfnt_off0000995f.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x995F 4324 bytes

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