Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e815e0c4e73114b…

MALICIOUS

PDF

44.8 KB Created: 2020-08-06 15:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4ba645fcb2773253bb233f519193eb7 SHA-1: 396c90e661170c398d3f622ecea99f391e9aecf4 SHA-256: 3e815e0c4e73114b0c5561ca48a5cc7b783b9cb8cd8cf27f5a058104d08d5ede
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.com) that is known to host malicious content. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=alkyl+halides+iit+jee+questions+pdf', suggesting a lure related to academic material to entice clicks. The ML classifier strongly supports the malicious nature of this PDF.

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.com/pify?keyword=alkyl+halides+iit+jee+questions+pdf
    • http://files.tallahasseechinesemedicine.com/uploads/1/3/1/4/131483361/4324964.pdf
    • http://files.lanesboroughprimaryschool.ie/uploads/1/3/1/4/131453329/8924204.pdf
    • http://files.young-knives.co.uk/uploads/1/3/2/7/132740747/voxexazu_keravuzuzu.pdf
    • http://kumitazek.chtechlab.com/uploads/1/3/0/7/130775934/sanekukoz-vuwopopejen-pefum-beveler.pdf
    • http://pukam.nativityfaithformation.org/uploads/1/3/1/4/131407668/wuzapeb.pdf
    • https://cdn.shopify.com/s/files/1/0431/7757/4562/files/29418617820.pdf
    • https://cdn.shopify.com/s/files/1/0429/8797/8913/files/tefuxizeki.pdf
    • https://cdn.shopify.com/s/files/1/0436/0844/0990/files/80876105814.pdf
    • https://cdn.shopify.com/s/files/1/0438/1615/7344/files/challenges_of_democracy.pdf
    • https://cdn.shopify.com/s/files/1/0431/8691/3431/files/55564759700.pdf
    • https://cdn.shopify.com/s/files/1/0437/6877/4807/files/77351541028.pdf
    • https://cdn.shopify.com/s/files/1/0432/8259/6004/files/52920422246.pdf
    • https://cdn.shopify.com/s/files/1/0428/6958/8124/files/redbox_rental_time.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/23671836116.pdf
    • https://cdn.shopify.com/s/files/1/0434/6370/4729/files/all_mathematics_formula_of_class_10.pdf
    • https://cdn.shopify.com/s/files/1/0450/1661/3014/files/bobcat_610_service_manual_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/9899/4856/files/36950156986.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_off000062fc.bin
0872e4c9278cf9bce842c35332cf3ffa7cd9036b7c9bbedd7677763af50435d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62FC 5272 bytes
font_01_sfnt_off000074e9.bin
0840f6cafc56cc375510edade2f2b071fc2286958c376f78e0a404ed04fc8b78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74E9 10280 bytes
font_02_sfnt_off00009805.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9805 4324 bytes

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