Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a0b36710b336bf…

MALICIOUS

PDF

106.9 KB Created: 2020-08-08 05:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 544f421695588ba4b190fc3e69fb7a0d SHA-1: f0fe9cb01164ca873ba52d47e28f92d50fcb4e5a SHA-256: 71a0b36710b336bfe153df6e9ffe54a36e4459a22c496e1baa1306013134b4e0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. This URL is presented within the document body, disguised as a link to download books. The PDF also exhibits characteristics of a link farm, with numerous external links, many of which are benign Shopify URLs, but the primary redirector is malicious. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.com/pify?keyword=muhammad+al+ghazali+books+pdf
    • http://files.ogdcl-nthp.com/uploads/1/3/1/0/131071312/xolajudojobibukojuti.pdf
    • http://zodemab.christianmeditationrookies.org/uploads/1/3/1/4/131453133/19610844eb50ac.pdf
    • http://levux.saxonquill.com/uploads/1/3/1/4/131482995/eaf2c405d147dbb.pdf
    • http://files.markferickson.com/uploads/1/3/1/4/131453917/902e2b05d34b.pdf
    • http://files.onedaymorefitness.com/uploads/1/3/0/7/130740298/7027145.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0440/4215/8245/files/67383695223.pdf
    • https://cdn.shopify.com/s/files/1/0429/2775/1321/files/jemarofujodavidajukukati.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3758/files/47426829006.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/43778875991.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6651/files/bonatedexozotuwawigotizav.pdf
    • https://cdn.shopify.com/s/files/1/0436/9865/1288/files/52536987579.pdf
    • https://cdn.shopify.com/s/files/1/0429/9181/2767/files/consonant_clusters_activities.pdf
    • https://cdn.shopify.com/s/files/1/0432/7810/6779/files/htps_windows._github._com.pdf
    • https://cdn.shopify.com/s/files/1/0434/5685/6230/files/hotel_accountant_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/1576/5159/files/samsung_sm-_g900a.pdf
    • https://cdn.shopify.com/s/files/1/0429/7143/1065/files/60586308462.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00016797.bin
4fd49877d06525a5c30e08813e2a2e377f612ca2452819e09c9cdefb0b41c542		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16797 22364 bytes
font_00_sfnt_off00012e46.bin
505c12d2415c5d0c81141ad585957b1d31eb24451fc3deadb983f7fb53ee9d0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E46 5196 bytes
font_01_sfnt_off00013ff5.bin
3cb6da15ca6d13b9ee0e80ccbfc8b233400a5545f5f2cb64ff113e41d2ba3df4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF5 12312 bytes
font_03_sfnt_off00018db5.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18DB5 4324 bytes

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