Malicious PDF — malware analysis report

Static analysis result for SHA-256 bafd737660ac581e…

MALICIOUS

PDF

114.1 KB Created: 2020-08-14 02:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cdb18586cc5ca68bddd68316c94510e3 SHA-1: 27108ecd60312bf343e45e98563be145f653be48 SHA-256: bafd737660ac581ed1a6bc5b0e052cc22e112b3832f2f32abebe0c03bdf45267
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating a link to known malicious infrastructure. The embedded URL 'https://ttraff.ru/pify?keyword=are+calvinism+and+reformed+theology+the+same' is directly referenced in the document body and is likely the primary lure. The PDF also contains a PDF_SEO_LINK_FARM heuristic, suggesting it's part of a larger link farm operation, with numerous links pointing to Shopify domains, one of which is 'https://cdn.shopify.com/s/files/1/0435/5201/4491/files/xray_ultimate_minecraft.pdf'. 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=are+calvinism+and+reformed+theology+the+same
    • http://files.hardlineservices.com/uploads/1/3/1/4/131437604/banojad.pdf
    • http://ranitodib.countryroadsanimalrescue.com/uploads/1/3/0/7/130739024/pasekagare.pdf
    • http://files.moonlightcabins.com/uploads/1/3/1/0/131070481/lanadid.pdf
    • http://files.petsinneedksa.org/uploads/1/3/0/7/130739081/vegam.pdf
    • https://cdn.shopify.com/s/files/1/0435/5201/4491/files/xray_ultimate_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0433/5311/2735/files/deep_learning_books.pdf
    • https://cdn.shopify.com/s/files/1/0427/5427/7532/files/89129325430.pdf
    • https://cdn.shopify.com/s/files/1/0432/2128/7080/files/baixar24_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/4901/7756/files/nukumuguderaxu.pdf
    • https://cdn.shopify.com/s/files/1/0436/4288/0160/files/alexander_burke_halleluyah_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0432/3544/2855/files/wafozikuzudegazeli.pdf
    • https://cdn.shopify.com/s/files/1/0431/7095/5424/files/17072668259.pdf
    • https://cdn.shopify.com/s/files/1/0433/8155/5350/files/welakalalidudu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6640/1692/files/zukamexotawibokib.pdf
    • https://cdn.shopify.com/s/files/1/0434/0226/4741/files/wasumigofavafosekimamimos.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zenafepejeviwasi.pdf
    • https://cdn.shopify.com/s/files/1/0427/7148/0742/files/longest_increasing_path_in_a_matrix.pdf
    • https://cdn.shopify.com/s/files/1/0434/2824/9767/files/ancova_test_pdf.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_off00018003.bin
bbc35ff78728d93744db4e6c61e5c7a53b689293af60e763b6097e4546fc44c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18003 5588 bytes
font_01_sfnt_off000192db.bin
d7831c3c17f8896e6bf4d2365b5b6ffbf4a887caa5b4f587c4d85d26da4269e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x192DB 11940 bytes

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