Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c552179bab6871e…

MALICIOUS

PDF

40.7 KB Created: 2020-09-03 03:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 198c252cb0d5ac61f6cf33fd11b825d6 SHA-1: f1a60427a9071119db918aa09d17efe3ed6616c8 SHA-256: 7c552179bab6871e4447f91c42edbe9a8b1a236b0eb3800d1449479f007ac766
154 Risk Score

Malware Insights

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

This PDF document contains a link farm, with many links pointing to external PDF files. One of the primary links, disguised as sheet music, redirects to malicious infrastructure at ttraff.ru. The ML classifier strongly indicates maliciousness, and the PDF structure suggests an attempt to manipulate search engine rankings or distribute malware via a link farm.

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=katyusha+classical+guitar+sheet+music
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/76de1a_229e5a2a4a9b46279861c97eda40606a.pdf
    • https://static.usrfiles.com/ugd/06497e_533d091b2c4b40388efe969c3a1acc08.pdf
    • https://static.usrfiles.com/ugd/9d66c7_d54383ee39bf4c418d351b28bc80dac4.pdf
    • https://static.usrfiles.com/ugd/3cb679_22f62e527d5e4fc58e5602b835d23de9.pdf
    • https://static.usrfiles.com/ugd/b8c837_59b09932d81247ee9886183dbe279cfc.pdf
    • https://static.usrfiles.com/ugd/cdb50c_e1f047d425784f039c5d9c1e4a186bc9.pdf
    • https://static.usrfiles.com/ugd/5ed537_a75e1408a3d14d08a35b7a00e62989a6.pdf
    • https://static.usrfiles.com/ugd/2b3f46_d3a89249ec954bd29cc4b49e4e2bea4d.pdf
    • https://cdn.shopify.com/s/files/1/0427/6954/7431/files/bomomikivinalubokisamegu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6026/5117/files/zalowajujinulofowu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3553/3218/files/federal_arbitration_act.pdf
    • https://cdn.shopify.com/s/files/1/0440/7282/9078/files/balupu_movie_audio_songs_naa_songs.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dusegu.pdf
    • https://cdn.shopify.com/s/files/1/0457/3747/6252/files/aeroplane_clipart_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/6231/9517/files/visit_http_www.adobe.com_go.pdf
    • https://cdn.shopify.com/s/files/1/0438/2323/5234/files/6728421675.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_off00005432.bin
dd5f541000b802da1108169b3a154666c42443820abe8a60e621723772ac440f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5432 5284 bytes
font_01_sfnt_off00006612.bin
08a8c3fbe9d3c279ddff14fa0028b03f8e1e2ae90ee200608b97fec73fbad725		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6612 14552 bytes

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