Malicious PDF — malware analysis report

Static analysis result for SHA-256 025b04c9513886e2…

MALICIOUS

PDF

47.8 KB Created: 2020-08-25 00:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ffe7dceb78e87e9abda72b2d8ab063f SHA-1: e59e265ad0a3414ccf410857fd1c0a14bc804c31 SHA-256: 025b04c9513886e217be39be374e4ad85456a34f29aa5b886673068cbc57871c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The document body, though partially corrupted, suggests a lure related to "Facebook ad types cheat sheet" to entice users to click on these links. The ML classifier strongly indicates maliciousness, and the presence of numerous external links is a common tactic for distributing malware or phishing content.

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=facebook+ad+types+cheat+sheet
    • http://witokosat.gaiacrystals.com/uploads/1/3/0/7/130776445/a756311dda06efa.pdf
    • http://files.lifebeforetheruins.com/uploads/1/3/1/8/131871633/napunawidisige_pujodid.pdf
    • http://files.vacavillelimousines.com/uploads/1/3/2/6/132695428/2402444.pdf
    • http://kudeguba.saranyawellness.com/uploads/1/3/0/7/130775818/6853108.pdf
    • http://bozizaxa.markhammeadows.com/uploads/1/3/1/4/131407406/zirulumaresax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1547/0245/files/8763341511.pdf
    • https://cdn.shopify.com/s/files/1/0429/3859/7539/files/audiovision_music_player_apk.pdf
    • https://cdn.shopify.com/s/files/1/0431/3051/9716/files/advantages_of_internet_advertising.pdf
    • https://cdn.shopify.com/s/files/1/0430/1045/7753/files/sat_2_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/4138/9724/files/adobe_flash_player_windows_xp_opera.pdf
    • https://cdn.shopify.com/s/files/1/0435/4618/1787/files/pubutijoj.pdf
    • https://cdn.shopify.com/s/files/1/0436/3547/4590/files/kurodurezatumes.pdf
    • https://cdn.shopify.com/s/files/1/0433/4977/0408/files/29233575338.pdf
    • https://cdn.shopify.com/s/files/1/0430/0885/2117/files/golukenazupolamixuwune.pdf
    • https://cdn.shopify.com/s/files/1/0432/2780/7911/files/colorimetric_determination_of_iron_in_water.pdf
    • https://cdn.shopify.com/s/files/1/0437/0992/3481/files/60392163048.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d3e.bin
b8fd1b72ba6dacfaa63cbe853eb3cec14b52e1dc830cd3b782bd9a57fcf42f64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D3E 5292 bytes
font_01_sfnt_off00008f39.bin
a836b6939f54565f3051e1ce823ce8639e743d0a4cead9473416766a3d468747		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F39 10352 bytes

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