Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a686c5ac72fc10f…

MALICIOUS

PDF

72.8 KB Created: 2020-08-29 22:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38166d341f676e0a0cda933514bd66c4 SHA-1: e2e4a29c11877958d416976b99971dbf29199109 SHA-256: 3a686c5ac72fc10fc43c29a9fe7d36ba0b31861926b01f00e2612fcce6b34cc9
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier as malicious and contains a high number of external links, many of which point to a redirector infrastructure. One specific URL, https://ttraff.cc/wix?keyword=maquinas+electricas+chapman+pdf, is identified as a known malicious redirector. The document body contains garbled text and what appears to be metadata from the wkhtmltopdf tool, suggesting it was programmatically generated to host these links.

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.cc/wix?keyword=maquinas+electricas+chapman+pdf
    • https://static.usrfiles.com/ugd/b8c837_0caf9dcfc96840cc8396062fb021bf47.pdf
    • https://static.usrfiles.com/ugd/ea9bdf_3948e4cf4d934d4f97d52b07707a172b.pdf
    • https://static.usrfiles.com/ugd/b8c837_d0f772c3b4b14dcb99e4c7c730263c97.pdf
    • https://static.usrfiles.com/ugd/b8c837_40fac45572904770b6423b61e4f8c578.pdf
    • https://static.usrfiles.com/ugd/ea9bdf_39bd8a58682542fe8ebd374f06b736b1.pdf
    • https://static.usrfiles.com/ugd/286fb8_f73562eabe7b4f14a3970f4608ab1e46.pdf
    • https://cdn.shopify.com/s/files/1/0430/2589/1479/files/wizudijavirukuvalapalotor.pdf
    • https://cdn.shopify.com/s/files/1/0433/7342/8890/files/rudaxefimuxodukesub.pdf
    • https://cdn.shopify.com/s/files/1/0431/1816/6167/files/abbyy_transformer_12._0_crack.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/extens_c3_a3o_chrome_aliexpress.pdf
    • https://cdn.shopify.com/s/files/1/0431/2324/5216/files/armnicas_en_sistemas_elctricos_industriales_armando_llamas.pdf
    • https://cdn.shopify.com/s/files/1/0439/4231/4152/files/calculus_early_transcendentals_6th_edition_james_stewart_solution_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/5381/7749/files/vadurososubatedeno.pdf
    • https://cdn.shopify.com/s/files/1/0450/9194/6661/files/convert_swf_to.pdf
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/92334341156.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_off0000cd7d.bin
09b8937a30ed3f80e5f69a610545f3d6831c7c2937fb5b6a1a5bc148fcfcb679		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7D 5524 bytes
font_01_sfnt_off0000e00d.bin
0810ce0371bb48a6dbbb6c56d423a1e4bda4455f4638deeed9c91ec23a796c96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE00D 1728 bytes
font_02_sfnt_off0000e8a5.bin
f6b6fcba6167d454d83614b09774dddb4f6280a62a4bb36763a0ba27cd58ed8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A5 14364 bytes

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