Malicious PDF — malware analysis report

Static analysis result for SHA-256 faae05392ee2d2d2…

MALICIOUS

PDF

55.0 KB Created: 2020-08-24 17:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbca16d560d62f41408fe63611e4450a SHA-1: 83a20f98c46c374b06ff99f4eb386531a1010d65 SHA-256: faae05392ee2d2d2dbc286e7f9f6389fdfe73005b42fc18bab95a19b981f7f93
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The document body itself is heavily obfuscated but contains references to URLs that are part of a link farm. This suggests the primary goal is to lure users to malicious sites, potentially for phishing or malware distribution.

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=abba+mamma+mia+album
    • http://pajajaz.diversejewellers.com/uploads/1/3/0/8/130873927/9699437.pdf
    • http://kebok.jointeffects.net/uploads/1/3/1/3/131383483/1128252.pdf
    • https://cdn.shopify.com/s/files/1/0430/4273/4237/files/yamaha_f90_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/8493/0462/files/74238387758.pdf
    • https://cdn.shopify.com/s/files/1/0435/4244/6231/files/17441758698.pdf
    • https://cdn.shopify.com/s/files/1/0429/6690/9081/files/70444874444.pdf
    • https://cdn.shopify.com/s/files/1/0432/1997/6350/files/pathfinder_2e_character_sheet_fillable.pdf
    • https://cdn.shopify.com/s/files/1/0448/3717/5456/files/bacteriologia_y_virologia_medica.pdf
    • https://cdn.shopify.com/s/files/1/0432/1335/7214/files/21390908721.pdf
    • https://cdn.shopify.com/s/files/1/0431/6217/3602/files/sojejojudejipi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6723/5742/files/bibiriluduxojodelami.pdf
    • https://cdn.shopify.com/s/files/1/0435/9412/1379/files/sosaf.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_off00008b0f.bin
ecebd52a89243745d6e2fc65a3113c4b19e7cf747177c785ddb5a7553d8eff33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B0F 4688 bytes
font_01_sfnt_off00009aee.bin
b6835ef4b85ad0545b351cfb631d6a7608169189751b88a0c0ffa035b9983d11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AEE 17004 bytes

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