Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecaa83e62c114e5f…

MALICIOUS

PDF

96.8 KB Created: 2020-08-10 00:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd6e04368493e019e266ee2eaa5c64e3 SHA-1: d1f9331de164e478aa17b235ca252526e34c28cc SHA-256: ecaa83e62c114e5f2176fe5116826a044625a1480131a27979cfda27dec35ea6
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to obscure the final destination. The document body, though heavily obfuscated, contains the same URL and a keyword related to a 'U bahn berlin pdf map', suggesting a lure. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, many pointing to Shopify, likely to appear legitimate while masking the malicious redirector. The ML classifier 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.cc/pify?keyword=u+bahn+berlin+pdf+map
    • http://files.maywoodmutualwatercompanyno3.com/uploads/1/3/1/3/131384070/4941186.pdf
    • http://files.haos2k.info/uploads/1/3/1/6/131606092/julexaniw.pdf
    • http://files.mountainstudiohamilton.ca/uploads/1/3/1/6/131606314/5376360.pdf
    • https://cdn.shopify.com/s/files/1/0427/8861/8396/files/32935333389.pdf
    • https://cdn.shopify.com/s/files/1/0439/2324/3176/files/california_physical_science_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0438/8143/1195/files/49947469953.pdf
    • https://cdn.shopify.com/s/files/1/0431/2757/0596/files/xudewaxeramivunelimujopal.pdf
    • https://cdn.shopify.com/s/files/1/0430/4361/8965/files/11699893998.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/76049406064.pdf
    • https://cdn.shopify.com/s/files/1/0438/1586/2434/files/zuzuzerazidopimaloxov.pdf
    • https://cdn.shopify.com/s/files/1/0432/3141/2379/files/29067340371.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nemevisofopanufu.pdf
    • https://cdn.shopify.com/s/files/1/0438/8470/7992/files/karatsuba_multiplication_c.pdf
    • https://cdn.shopify.com/s/files/1/0451/3293/9417/files/gadabimipur.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/microsoft_word_convert_to_docx.pdf
    • https://cdn.shopify.com/s/files/1/0435/8812/4829/files/49324823345.pdf
    • https://cdn.shopify.com/s/files/1/0429/3669/6995/files/amhran_na_bhfiann_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0428/6647/5174/files/tusutufavime.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_off0001240b.bin
dd43a68acdd390e7effcb42d786add159fa945eb9fc030d6361f108c5b793635		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1240B 4832 bytes
font_01_sfnt_off0001342b.bin
dc6ca3221a851d8211fd63de66a4454114e12ea8ee5472d0be51ec4fe78452c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1342B 16872 bytes
font_02_sfnt_off00016681.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16681 4324 bytes

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