Malicious PDF — malware analysis report

Static analysis result for SHA-256 64870f99d9e92d8e…

MALICIOUS

PDF

57.8 KB Created: 2020-08-24 22:41:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b6fe272b365d300215c5a354b31c0ad SHA-1: 6e9152c23c369c8c3faa461034e4d0107523b7f1 SHA-256: 64870f99d9e92d8efd9b9b04154f07aab2f69b12126bc66c7b746768959d8e82
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to potentially malicious or unknown domains, indicating a link farm or redirection attempt. The primary heuristic firing highlights a link to known malicious redirector infrastructure, suggesting the document's purpose is to lead users to harmful sites. No scripts were extracted, and the document body is heavily obfuscated, making it difficult to determine the exact nature of the lure beyond the presence of numerous 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/pify?keyword=begin+the+beguine+piano+pdf
    • http://girogas.hotstuffromance.com/uploads/1/3/0/8/130874277/fewigunanizadaw.pdf
    • http://kamuwumol.sharrattwater.com/uploads/1/3/1/6/131637047/vadudixasamepi.pdf
    • http://files.hillmensoccer.org/uploads/1/3/1/8/131856917/lukizabuzu.pdf
    • http://kinar.fcwomenandfamilyshelter.org/uploads/1/3/1/8/131871478/4faeb4e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/0265/7957/files/should_i_stop_autocomplete.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54341666742.pdf
    • https://cdn.shopify.com/s/files/1/0432/6057/5894/files/examples_of_assets_and_liabilities.pdf
    • https://cdn.shopify.com/s/files/1/0438/0390/2112/files/blank_map_of_european_countries.pdf
    • https://cdn.shopify.com/s/files/1/0430/3880/2073/files/rulazevu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9696/5269/files/android_studio_rename_path.pdf
    • https://cdn.shopify.com/s/files/1/0435/4116/8283/files/89299094946.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vakijuxek.pdf
    • https://cdn.shopify.com/s/files/1/0429/5252/3929/files/51393171036.pdf
    • https://cdn.shopify.com/s/files/1/0434/6766/9654/files/wogunadovupezug.pdf
    • https://cdn.shopify.com/s/files/1/0430/1609/3849/files/45319615980.pdf
    • https://cdn.shopify.com/s/files/1/0431/5031/1579/files/blank_tri_fold_brochure_template.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f0f.bin
d9f651fc7a466614d898cb73ccef2a1066041a42dc86829fc6b5b54bae3ba996		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F0F 5068 bytes
font_01_sfnt_off00008048.bin
10dfd5b01b3402215281a1129128e2ea3d754487b3aea3a7e0e6b910504c3e43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8048 16932 bytes
font_02_sfnt_off0000b50e.bin
15a68420f1c377824b8c1fd571ac7c30556db1b4bc05006bf44ec3f6c6c83208		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB50E 16120 bytes
font_03_sfnt_off0000c9f5.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F5 4324 bytes

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