Malicious PDF — malware analysis report

Static analysis result for SHA-256 158e23a0a8e22591…

MALICIOUS

PDF

48.2 KB Created: 2020-08-12 01:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ad8232f3fd95d95502ec0066967f9fb SHA-1: f82e801bf15fe334e14f8c130611781287afff18 SHA-256: 158e23a0a8e22591d9c0e0de732fff4d28c9efdd089d715daadfa21c18aac618
162 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector URL, indicating a malicious intent to direct users to harmful content. The presence of a 'download button' lure further supports this. Although no scripts were extracted, the PDF structure and embedded links strongly suggest it's part of a phishing or scam campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=astm+a530+a530m+pdf
    • http://fawupif.thehigginsreport.com/uploads/1/3/1/1/131163930/2197638.pdf
    • http://files.uchabitat.org/uploads/1/3/2/6/132681501/402aa54811.pdf
    • http://files.countrygiftandthrift.com/uploads/1/3/1/3/131379567/pubamovob_poxavepeliwu_furak_ketekazu.pdf
    • http://files.aledobandboosters.org/uploads/1/3/0/8/130813796/8186492.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/2nd_grade_common_core_math_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46946939033.pdf
    • https://cdn.shopify.com/s/files/1/0433/7192/1571/files/kujepitesa.pdf
    • https://cdn.shopify.com/s/files/1/0432/5359/6310/files/38626545063.pdf
    • https://cdn.shopify.com/s/files/1/0428/3806/5308/files/wedogomodekaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/8876/4316/files/93220838224.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1713/files/5852207947.pdf
    • https://cdn.shopify.com/s/files/1/0432/4232/4125/files/rojofodakenajoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/2890/5127/files/xodafatev.pdf
    • https://cdn.shopify.com/s/files/1/0443/2547/0364/files/variable_annuities.pdf
    • https://cdn.shopify.com/s/files/1/0430/4253/7629/files/46379183351.pdf
    • https://cdn.shopify.com/s/files/1/0434/6845/6086/files/nalid.pdf
    • https://cdn.shopify.com/s/files/1/0432/7368/3112/files/bagels_and_beans_menu.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_off00006c86.bin
52c53b59c437b2e76d6a1aac599fbb8696843af074e0d081f374572619bf5a60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C86 3384 bytes
font_01_sfnt_off0000789f.bin
f16ac03fa51db57116cd75e4c7288e0c9e27305198e377f6f95d4043d604db7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x789F 5476 bytes
font_02_sfnt_off00008b27.bin
72ead7a7fcd9eb6a1ebc59aac462f5ae7b75e5e8d9105764feed532950a2261e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B27 12600 bytes

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