Malicious PDF — malware analysis report

Static analysis result for SHA-256 744f3bec49e3fd30…

MALICIOUS

PDF

44.7 KB Created: 2020-08-22 04:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b295c855311712144c92299584cd9aea SHA-1: d7d662f4cba9bad1c3799168c9d2418d43a962ce SHA-256: 744f3bec49e3fd30a8be739db61c3e15de82410e6a6dc7344a43abf85cf412dc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one prominent link directing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for a product manual, suggesting a phishing or scam attempt. The presence of a large number of external links, many pointing to Shopify-hosted PDFs, indicates a link farm designed to obscure the malicious redirector.

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=astro+a40+mixamp+pro+manual
    • http://files.nysfcja.org/uploads/1/3/0/9/130969489/mobut_gibonezofidexe_giwukozux_welitedisatis.pdf
    • http://files.pdxprays.com/uploads/1/3/1/3/131383018/wikixawasagi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/5071/9642/files/87381561978.pdf
    • https://cdn.shopify.com/s/files/1/0427/9199/3500/files/41315520217.pdf
    • https://cdn.shopify.com/s/files/1/0439/3785/7691/files/42134360706.pdf
    • https://cdn.shopify.com/s/files/1/0433/4387/2150/files/65301077960.pdf
    • https://cdn.shopify.com/s/files/1/0430/9496/6421/files/bajokiloril.pdf
    • https://cdn.shopify.com/s/files/1/0430/4325/8519/files/25802418224.pdf
    • https://cdn.shopify.com/s/files/1/0431/6394/3067/files/lusexoto.pdf
    • https://cdn.shopify.com/s/files/1/0434/0737/6534/files/williamson_central_appraisal_district.pdf
    • https://cdn.shopify.com/s/files/1/0432/7433/8472/files/8488196208.pdf
    • https://cdn.shopify.com/s/files/1/0431/6738/3713/files/gupiromamaxe.pdf
    • https://cdn.shopify.com/s/files/1/0437/3859/5482/files/winobezabiv.pdf
    • https://cdn.shopify.com/s/files/1/0434/0695/0557/files/oscilloscope_theory.pdf
    • https://cdn.shopify.com/s/files/1/0430/0124/9955/files/ordinary_annuity_formula.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_off00005b4e.bin
ecd0f4e102e362332302c0ea593083491884e2097f61d4e316e775f0a1cbc422		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B4E 5016 bytes
font_01_sfnt_off00006c36.bin
311daa8a11f95ed5f35a807e1fe2c418d5bc507c0d9ebd91f36c77703ba08157		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C36 13892 bytes
font_02_sfnt_off000097fa.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97FA 4324 bytes

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