Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b26706a6f2f092…

MALICIOUS

PDF

48.1 KB Created: 2020-08-24 21:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 301f5bade35849d66e959b77988e8b69 SHA-1: 4a68011c7753a5a032240ddcc4438bd755dbc2c9 SHA-256: 20b26706a6f2f0921ec15ec135083453f8fe626a9f43c79c1965cdf137e6aa68
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that is also present in the embedded link list, suggesting a lure to external content. The primary attack pattern involves redirecting users to malicious sites through a deceptive 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.cc/pify?keyword=adrenal+cortex+disorders+pdf
    • http://vukasefap.super-sounds.com/uploads/1/3/0/9/130969280/4124705.pdf
    • http://tegopem.grangerlandrfd.com/uploads/1/3/2/7/132741100/43a2b5bff.pdf
    • http://wuzazasu.stationsurfshop.com/uploads/1/3/1/4/131408899/sogixoganafel.pdf
    • http://files.montgomerycountyhumanesocietync.com/uploads/1/3/1/8/131871659/b978ddee30d0.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/bibewoxo.pdf
    • https://cdn.shopify.com/s/files/1/0436/0588/5090/files/60557515386.pdf
    • https://cdn.shopify.com/s/files/1/0438/9378/4728/files/learning_disabilities_definition.pdf
    • https://cdn.shopify.com/s/files/1/0427/9628/6111/files/feromukutu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8228/4194/files/bagan_temple_map.pdf
    • https://cdn.shopify.com/s/files/1/0434/7589/4437/files/genetics_from_genes_to_genomes_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/4002/1407/files/69826763951.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jonamov.pdf
    • https://cdn.shopify.com/s/files/1/0431/7482/2043/files/curriculum_design.pdf
    • https://cdn.shopify.com/s/files/1/0437/1690/3062/files/que_es_genetica_molecular.pdf
    • https://cdn.shopify.com/s/files/1/0438/4587/7922/files/dinisikofuwizatilu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8808/5145/files/vanakizodelobe.pdf
    • https://cdn.shopify.com/s/files/1/0431/3209/2573/files/standard_discord_rules.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007f9f.bin
7683e5ff8ba1d07ffcac82a68bb845940d7c6b77ee1d1a364d343bcaad233cf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F9F 5204 bytes
font_01_sfnt_off0000915f.bin
5d8a46ea768b64f4008f5f492b7554de6cab68c165de75b775656960941eef6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x915F 10020 bytes

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