Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc09934a5eaacd9…

MALICIOUS

PDF

137.3 KB Created: 2020-08-02 11:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea29703067bc912e3c6df5dd7e1965dc SHA-1: f68e70ddd117eb143eff45b5bd337aad0fac5714 SHA-256: 1dc09934a5eaacd9e325e7f5ead0671db924f0b753202b3e5ec5fdbaff936da5
154 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics as malicious, specifically for containing a link to known malicious redirector infrastructure. The ML classifier also returned a high confidence score. The document body contains the malicious URL, indicating it is likely intended to lure the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=%25D0%25B4%25D0%25BE%25D0%25BC+2+%25D0%25BD%25D0%25B0+6+%25D0%25B4%25D0%25BD%25D0%25B5%25D0%25B9+%25D1%2580%25D0%25B0%25D0%25BD%25D1%258C%25D1%2588%25D0%25B5+%25D1%258D%25D1%2584%25D0%25B8%25D1%2580%25D0%25B0
    • http://files.naturehillsfarm.com/uploads/1/3/1/8/131871462/d11decb.pdf
    • http://files.aprilfordart.com/uploads/1/3/1/0/131070374/69244d.pdf
    • http://files.losslessimagery.com/uploads/1/3/1/4/131411542/dopezovusoj.pdf
    • http://files.precisionrifle.shop/uploads/1/3/0/7/130739510/nusozefanigaje_nojixopuxazodax_sugasavorod_bovazodobupado.pdf
    • http://files.catherinecarterpainting.com/uploads/1/3/1/8/131856456/xotew.pdf
    • https://cdn.shopify.com/s/files/1/0434/5217/0392/files/20168720834.pdf
    • https://cdn.shopify.com/s/files/1/0448/0250/6909/files/rogue_5e_multiclass.pdf
    • https://cdn.shopify.com/s/files/1/0437/5419/3047/files/76623524001.pdf
    • https://cdn.shopify.com/s/files/1/0431/6292/7263/files/kasufatum.pdf
    • https://cdn.shopify.com/s/files/1/0433/4646/0830/files/xupanuxusepadijulok.pdf
    • https://cdn.shopify.com/s/files/1/0431/7249/5524/files/81903122932.pdf
    • https://cdn.shopify.com/s/files/1/0439/4015/1454/files/piwajoxugebe.pdf
    • https://cdn.shopify.com/s/files/1/0429/6497/5765/files/baweboz.pdf
    • https://cdn.shopify.com/s/files/1/0441/3512/1048/files/mahouka_koukou_no_rettousei_light_novel.pdf
    • https://cdn.shopify.com/s/files/1/0433/9000/9509/files/wuxatuwakazanerikiruw.pdf
    • https://cdn.shopify.com/s/files/1/0434/5282/5750/files/zilixerobaguwuxakobe.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_off0001d356.bin
05c3c0c2a97ff766003fa46ac576437e416434f60ee09ac593560902fbca6515		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D356 5944 bytes
font_01_sfnt_off0001e6f8.bin
9aeda74728312c9431f8756cb3544eb01c5e3f2bfb1964ca33bbdd4f844c151a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E6F8 14340 bytes

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