Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c2288083b71c2ea…

MALICIOUS

PDF

47.0 KB Created: 2020-08-22 17:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32f6f4fc3765c83bfca75bb8e72c9ea0 SHA-1: 101666dcc82e8a229b0f45e738c4d46cf55ea6b4 SHA-256: 5c2288083b71c2ea5d3f5f5210ecfc86ed9088b6d8747423f996694abc525078
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, indicating a link farm. One prominent URL, 'https://ttraff.ru/pify?keyword=costco+bread+nutrition+information', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to URLs and appears to be part of a lure to direct users to malicious infrastructure.

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=costco+bread+nutrition+information
    • http://junizoma.repetto5.com/uploads/1/3/1/3/131383483/muwozijimewejasoledi.pdf
    • http://files.the-trump-timeline.com/uploads/1/3/1/1/131164250/3adeb9d573dd7.pdf
    • http://files.diseaseecology.org/uploads/1/3/1/4/131437378/tamojerif.pdf
    • http://fovirilab.alextoenniges.com/uploads/1/3/2/6/132681504/nekijizim-xabixirapas-pusosiraz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6917/6992/files/cutting_edge_3rd_edition_intermediate_teacher_s_book.pdf
    • https://cdn.shopify.com/s/files/1/0427/7354/5116/files/air_force_loc_rebuttal_example.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/troy_bilt_2700_pressure_washer_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/1379/0106/files/basic_terminology_of_stock_market.pdf
    • https://cdn.shopify.com/s/files/1/0431/4575/6833/files/middle_east_after_world_war_2.pdf
    • https://cdn.shopify.com/s/files/1/0433/6176/3480/files/825975555.pdf
    • https://cdn.shopify.com/s/files/1/0430/9565/4564/files/bozuxilazekelepom.pdf
    • https://cdn.shopify.com/s/files/1/0428/9350/8771/files/daxuwajagevamukuvibim.pdf
    • https://cdn.shopify.com/s/files/1/0429/5612/8412/files/1255574879.pdf
    • https://cdn.shopify.com/s/files/1/0452/5942/3904/files/arquimedes_biografia.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_off00007ac8.bin
c607e1462127ce874522de12fc2fe04bd6ae5b38a61210064fe3713db8be6542		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC8 5180 bytes
font_01_sfnt_off00008c48.bin
2f74e5d188e5c752b3bf5a8d78027c95c31a5bda0f33faa73af0913ce79a141b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C48 10256 bytes

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