Malicious PDF — malware analysis report

Static analysis result for SHA-256 631a750fcfe2f566…

MALICIOUS

PDF

37.7 KB Created: 2020-08-05 09:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 482fd37caa1cf1ba2982abd9dc0d65ab SHA-1: 2867dd288fd0c80b615985c84c995e02f68097e6 SHA-256: 631a750fcfe2f566f3b5be9c64e144eea7fe50c7ae7c79eefd951b5b3c5f638a
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to what appears to be a link farm designed to host numerous PDF files. One of the primary links, https://ttraff.com/pify?keyword=ballade+pour+adeline+sheet+music+pdf+guitar, is flagged as a malicious redirector. This suggests the document is designed to lure users into clicking these links, potentially leading them to malicious content or phishing sites.

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=ballade+pour+adeline+sheet+music+pdf+guitar
    • http://files.carolynskei.com/uploads/1/3/1/6/131606261/327380.pdf
    • http://files.alinereisfutbol.com/uploads/1/3/0/8/130874246/50557.pdf
    • http://files.michaelasavell.com/uploads/1/3/1/0/131070374/742483.pdf
    • http://files.michelleperrett.com/uploads/1/3/0/7/130738636/6820424.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/4324/9576/files/6756803286.pdf
    • https://cdn.shopify.com/s/files/1/0427/6781/0726/files/borutadukamip.pdf
    • https://cdn.shopify.com/s/files/1/0429/3849/9235/files/45951306203.pdf
    • https://cdn.shopify.com/s/files/1/0434/3431/1845/files/90016603378.pdf
    • https://cdn.shopify.com/s/files/1/0432/3514/7933/files/widir.pdf
    • https://cdn.shopify.com/s/files/1/0431/6869/4423/files/jevijinuxabutus.pdf
    • https://cdn.shopify.com/s/files/1/0433/0510/7620/files/95874555434.pdf
    • https://cdn.shopify.com/s/files/1/0433/5514/4347/files/zaviwilopubikojikek.pdf
    • https://cdn.shopify.com/s/files/1/0428/2250/0518/files/26790057765.pdf
    • https://cdn.shopify.com/s/files/1/0429/9040/3737/files/wabof.pdf
    • https://cdn.shopify.com/s/files/1/0430/7533/8391/files/puwokefimedupuv.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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004785.bin
6e222561afbc79bd6aa3b8bb135c90979e1d9be1dc03c38ee18618166d430b57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4785 5500 bytes
font_01_sfnt_off00005a05.bin
3fe6ba0bcac7cef203c92f3105514e40bbd4e99f1fdf7f994786a29051d4e10a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A05 10028 bytes
font_02_sfnt_off00007b93.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B93 4324 bytes

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