Malicious PDF — malware analysis report

Static analysis result for SHA-256 93628dcf266e16ce…

MALICIOUS

PDF

51.2 KB Created: 2020-08-05 05:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: faa5fb61ade6f90e3daabbe326a9cb66 SHA-1: 27dc729e0b510dbbb5329db9de290086d66e4352 SHA-256: 93628dcf266e16ce52dee2f055e90167882e0b30e2a462e026b315dbffafce93
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm hosted on Shopify. One of the primary links, https://ttraff.ru/pify?keyword=relaxing+piano+sheet+music+pdf, is identified as a malicious redirector. This suggests the document is designed to funnel users to malicious sites under the guise of providing sheet music. The ML classifier also strongly indicated maliciousness.

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=relaxing+piano+sheet+music+pdf
    • http://files.alternativeboomerlegacy.com/uploads/1/3/2/8/132815015/lofulapulavujez-ziwokiwo-zozagapirel.pdf
    • http://xizew.revkristenkuriga.com/uploads/1/3/0/7/130775934/5508682.pdf
    • http://files.daisiesandchalk.com/uploads/1/3/2/6/132681826/8042238.pdf
    • http://files.win19.org/uploads/1/3/0/8/130814296/7724866.pdf
    • http://files.sharireplogle.com/uploads/1/3/0/7/130740073/d6a927982e3f.pdf
    • https://cdn.shopify.com/s/files/1/0435/9979/0243/files/popanixevupotijuvifufaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/1308/7142/files/7197890675.pdf
    • https://cdn.shopify.com/s/files/1/0431/5162/2305/files/69350232613.pdf
    • https://cdn.shopify.com/s/files/1/0431/5689/7947/files/491572185.pdf
    • https://cdn.shopify.com/s/files/1/0435/7462/4419/files/shark_vac_then_steam_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/7992/4902/files/zonavevanexep.pdf
    • https://cdn.shopify.com/s/files/1/0432/7296/2203/files/8170595271.pdf
    • https://cdn.shopify.com/s/files/1/0429/1795/3702/files/zasigoxatotu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0866/3456/files/86250969567.pdf
    • https://cdn.shopify.com/s/files/1/0432/5765/9560/files/hells_kitchen_season_12.pdf
    • https://cdn.shopify.com/s/files/1/0437/0910/4279/files/calculus_8th_edition_stewart_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46391305542.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_off00007610.bin
e27d3cc7ddc2801b2ec429983da1b80d21e2782edfff85c89b55a4363ede8632		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7610 5548 bytes
font_01_sfnt_off000088dd.bin
bc7271f5828b93ccbd312d2301cbbcabc60473eb69e93422141d5ba294d1b450		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88DD 9860 bytes
font_02_sfnt_off0000aacd.bin
9cfb948b915a4694feeb7f8719f2b65905b0a58e2ed918074a610570d07e7249		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAACD 16100 bytes

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