Malicious PDF — malware analysis report

Static analysis result for SHA-256 51868e21e0ef5bce…

MALICIOUS

PDF

113.7 KB Created: 2020-08-07 04:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30e1fc6f33c82d4f0909a7b2af9ffff1 SHA-1: 03b13c4c02b755c02572f3e258be645790cb4edb SHA-256: 51868e21e0ef5bceff18a6cb60cfc2b24412c530dac10821d862648d96b6a403
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 a known malicious redirector at 'https://ttraff.cc/pify?keyword=alfabeto+arabe+espa%25C3%25B1ol+pdf'. This suggests the document's primary purpose is to redirect users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious redirector URL is a strong indicator of a phishing or scam attempt.

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=alfabeto+arabe+espa%25C3%25B1ol+pdf
    • http://files.omanroadshow.com/uploads/1/3/1/3/131398143/ed373fde.pdf
    • http://files.allseeingeyedesign.com/uploads/1/3/1/8/131871740/jojadetudexu-dupotagu-furoxatosuw-dowiwek.pdf
    • http://files.reidswoodworks.com/uploads/1/3/1/8/131856519/0b1ededde29.pdf
    • https://cdn.shopify.com/s/files/1/0432/7417/4622/files/37061897018.pdf
    • https://cdn.shopify.com/s/files/1/0445/6385/7572/files/cabal_online_eod_b1f_guide.pdf
    • https://cdn.shopify.com/s/files/1/0439/8533/8526/files/29767067422.pdf
    • https://cdn.shopify.com/s/files/1/0428/2525/3023/files/zaxajemubasesobejitogota.pdf
    • https://cdn.shopify.com/s/files/1/0435/8311/1325/files/97864723115.pdf
    • https://cdn.shopify.com/s/files/1/0431/8828/9694/files/49243455871.pdf
    • https://cdn.shopify.com/s/files/1/0430/6694/9786/files/kitifas.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/25929320479.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23342697578.pdf
    • https://cdn.shopify.com/s/files/1/0432/3124/8541/files/2590608264.pdf
    • https://cdn.shopify.com/s/files/1/0432/4828/7912/files/software_engineers_quotes.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
stream_006_off000170e9.bin
c6a2beef89a980d335ed8f2273d09354601de7d4cbc54cfc48d3229fcc7dae2e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x170E9 43888 bytes
font_00_sfnt_off00012752.bin
34625767292dbf47bbddfec299ee8352edfcd24691ef59d34129e11a50d22018		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12752 5376 bytes
font_01_sfnt_off00013961.bin
afede86038ff962bacc30df2fe2b6fc849dc3e051b550e5e1283a6a94a924086		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13961 19472 bytes

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