Malicious PDF — malware analysis report

Static analysis result for SHA-256 11eea6520c442883…

MALICIOUS

PDF

41.9 KB Created: 2020-08-19 08:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b32192861f4161367aa271370d33cc99 SHA-1: 44508264ef6d2c7dead1aa2ec5e0d01d4bfa484d SHA-256: 11eea6520c4428834541b7af7dbbbf0522660e5ddf6eb735c5cc729f527da3b9
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 external resources, suggesting a link farm or redirection strategy. One prominent link, 'https://ttraff.cc/pify?keyword=make+labels+from+google+sheets', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to lure the user to a malicious site. 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.cc/pify?keyword=make+labels+from+google+sheets
    • http://files.landrumdc.com/uploads/1/3/1/3/131382028/8133067.pdf
    • http://komaboso.ringsnbling5.com/uploads/1/3/2/8/132816042/4b8ded.pdf
    • http://lakum.newportplusboardriders.com/uploads/1/3/1/3/131379362/gabopezo.pdf
    • http://files.brainmaker.net/uploads/1/3/0/7/130739970/0403f70db8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6241/1935/files/downpatrick_primary_school_inspection_report.pdf
    • https://cdn.shopify.com/s/files/1/0430/6495/0946/files/excel_active_worksheet_vba.pdf
    • https://cdn.shopify.com/s/files/1/0430/5597/2506/files/scree_plot_python.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96226605796.pdf
    • https://cdn.shopify.com/s/files/1/0427/4126/8647/files/jiveluvijifelob.pdf
    • https://cdn.shopify.com/s/files/1/0435/8812/4829/files/biology_11_textbook_miller_levine.pdf
    • https://cdn.shopify.com/s/files/1/0434/6452/3926/files/35302624660.pdf
    • https://cdn.shopify.com/s/files/1/0428/7676/4327/files/58556352920.pdf
    • https://cdn.shopify.com/s/files/1/0431/8288/2980/files/nalizabufajezegafewevalu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9868/6119/files/carrier_air_conditioner_brochure.pdf
    • https://cdn.shopify.com/s/files/1/0431/2114/8061/files/gijixafafaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/1829/7245/files/1991357284.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006554.bin
e67d68a5085898750aec76838bb1ddeb0004a5a69234d3bd142284c9536e0e23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6554 5392 bytes
font_01_sfnt_off0000778f.bin
d2f52f7bbe747591cc5beec5b3dc5691e9dc67b8a54b499dc9ed75dc80ae798b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x778F 10352 bytes

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