Malicious PDF — malware analysis report

Static analysis result for SHA-256 de490a4d3b28f62c…

MALICIOUS

PDF

55.7 KB Created: 2020-07-30 10:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2822111bb1446fa2bbb1c19fa27cc934 SHA-1: b46218bc5d0c0273f056b6f1fa191fc6959132ac SHA-256: de490a4d3b28f62c1c7f64a473065a4acbad1c4e20442b0769288199c7788316
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with a critical heuristic firing indicating a malicious redirector. The primary URL points to a redirector service, which in turn leads to a link farm hosted on Shopify. The document body, though heavily obfuscated, contains text related to 'Alif novel episode 3 pdf download', suggesting a lure to trick users into downloading potentially malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=alif+novel+episode+3+pdf+download
    • http://files.davidderr.com/uploads/1/3/1/3/131398308/vodadedavujumi-vajafeko.pdf
    • http://files.koffienator.nl/uploads/1/3/1/3/131398174/2486915.pdf
    • http://files.provisopartners.com/uploads/1/3/2/8/132814342/c89b827ccd21.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wifufokamavobopizevotug.pdf
    • https://cdn.shopify.com/s/files/1/0431/9684/2142/files/15296705485.pdf
    • https://cdn.shopify.com/s/files/1/0429/5340/8675/files/7625632244.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/656530067.pdf
    • https://cdn.shopify.com/s/files/1/0434/4116/0344/files/vakepudi.pdf
    • https://cdn.shopify.com/s/files/1/0437/4138/0762/files/sijibobobasawowanepepukan.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rixiridujafogidubiba.pdf
    • https://cdn.shopify.com/s/files/1/0434/3175/5932/files/46747999771.pdf
    • https://cdn.shopify.com/s/files/1/0438/7491/0376/files/29793928458.pdf
    • https://cdn.shopify.com/s/files/1/0437/7490/2423/files/88239824137.pdf
    • https://cdn.shopify.com/s/files/1/0437/0438/5690/files/5444223028.pdf
    • https://cdn.shopify.com/s/files/1/0434/0888/3870/files/32552008716.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/
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/65

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0000aafe.bin
d98bfe3f13d79f7b43987f9bcdcd3640614c865fcc202f045741226802412c0a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xAAFE 22516 bytes
font_00_sfnt_off00007784.bin
8069cb44c6a5275babd6357b720c09a90265dd268abf6b863643729a9034c7b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7784 4952 bytes
font_01_sfnt_off0000887a.bin
1655e969651a8d8dd52f1567753228a1abd1da3ce5d9b983c80cf16fac1719b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x887A 10036 bytes

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