Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ea9102f6dc17f7…

MALICIOUS

PDF

60.8 KB Created: 2020-08-24 05:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3882e7cf882a36f77bf68875da9d092 SHA-1: 37c66f13d4deab0267bebfc2c2be129ae1984014 SHA-256: d9ea9102f6dc17f792cc45b5cc9234f8dab29cb21e4e593438279b10cc6ef793
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The primary malicious URL identified is https://ttraff.ru/pify?keyword=classification+of+bacteria+according+to+morphology+pdf. The document body, though heavily obfuscated, contains this URL, suggesting a lure to a malicious site disguised as a benign document. The ML classifier also strongly indicated maliciousness.

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=classification+of+bacteria+according+to+morphology+pdf
    • http://files.irismeade.com/uploads/1/3/1/3/131384380/vajuvemuf-busalasesadato-bulatajofu-mazixufonix.pdf
    • http://files.ninosfamilyrestaurant.net/uploads/1/3/0/9/130969172/6982500.pdf
    • http://files.robertupstone.com/uploads/1/3/0/7/130739318/41bdaf9eedbb0.pdf
    • http://files.dreammakersuk.com/uploads/1/3/0/7/130775734/6145900.pdf
    • https://cdn.shopify.com/s/files/1/0430/7261/8657/files/arch_linux_pulseaudio.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/91976675767.pdf
    • https://cdn.shopify.com/s/files/1/0433/0999/0043/files/lavotevagek.pdf
    • https://cdn.shopify.com/s/files/1/0434/7772/9432/files/wogapobigir.pdf
    • https://cdn.shopify.com/s/files/1/0433/0625/4494/files/45743632555.pdf
    • https://cdn.shopify.com/s/files/1/0432/5729/9097/files/wumenimibufimu.pdf
    • https://cdn.shopify.com/s/files/1/0448/6879/6578/files/addition_and_subtraction_within_20_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dubisetebezurazoxodo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9917/6612/files/46761990307.pdf
    • https://cdn.shopify.com/s/files/1/0438/3604/7522/files/lolotulujuxil.pdf
    • https://cdn.shopify.com/s/files/1/0433/5756/9189/files/voril.pdf
    • https://cdn.shopify.com/s/files/1/0440/2708/4965/files/formatting_worksheets_in_excel_2013.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a04d.bin
169a7b1c158bad134583bf76ea9d3b0f2c045b73acc55237527424fa444c9b4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA04D 5620 bytes
font_01_sfnt_off0000b335.bin
cce4718eeec61f96f83e5129e7f18dfeaa33b712eb0fad2224b800209a6b864d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB335 11244 bytes
font_02_sfnt_off0000d758.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD758 4324 bytes

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