Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41668113e39b1fb…

MALICIOUS

PDF

63.6 KB Created: 2020-08-30 10:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df62c1d776b034d7412c80d909b4971a SHA-1: 00f4edf55b004afd7e136ae0b9409348ee76b979 SHA-256: a41668113e39b1fb48641cfa7b6ec71c51cb41986414831c2630551d7166f0a5
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/wix?keyword=empires+and+puzzles+proteus'. Additionally, it features a PDF link farm heuristic, indicating a large number of external links, with the first being 'https://cdn.shopify.com/s/files/1/0434/7042/2180/files/nolabunanekerafumozit.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, suggesting a lure to a game to entice clicks.

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=empires+and+puzzles+proteus
    • https://cdn.shopify.com/s/files/1/0434/7042/2180/files/nolabunanekerafumozit.pdf
    • https://cdn.shopify.com/s/files/1/0431/0617/3081/files/ejercicios_de_multiplicaciones_de_do.pdf
    • https://cdn.shopify.com/s/files/1/0429/9322/1783/files/99028015369.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5085/files/sindhu_bhairavi_serial_title_song.pdf
    • https://cdn.shopify.com/s/files/1/0437/6608/7838/files/how_to_speak_confidently_in_public.pdf
    • https://static.usrfiles.com/ugd/b28561_540061735daf4a94ac9002a9da8981e4.pdf
    • https://static.usrfiles.com/ugd/b8c837_ff8fc0a5d54a477b934dfb077d2d202c.pdf
    • https://cdn.shopify.com/s/files/1/0432/3164/1762/files/73026488472.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/28451860650.pdf
    • https://cdn.shopify.com/s/files/1/0437/9472/7074/files/karipixujumisijuzaxeja.pdf
    • https://cdn.shopify.com/s/files/1/0437/0602/4090/files/20273777924.pdf
    • https://cdn.shopify.com/s/files/1/0435/1167/7083/files/matlab_plot_multiple_figures.pdf
    • https://cdn.shopify.com/s/files/1/0432/7732/0348/files/65333968269.pdf
    • https://cdn.shopify.com/s/files/1/0430/1104/7575/files/zewivamudokitem.pdf
    • https://cdn.shopify.com/s/files/1/0432/5058/1662/files/caravan_stories_leveling_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/7177/4615/files/25933776579.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_off0000b07a.bin
a093e0c3a384f85dbeb680e89ec8eebbf50f8af70e1c4385092ba44630d3807b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB07A 5112 bytes
font_01_sfnt_off0000c1c4.bin
88567843176f30c3c3d800973ad10cf892279d8646f047f82512213faa598b60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C4 15464 bytes

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