Malicious PDF — malware analysis report

Static analysis result for SHA-256 170b38895c335744…

MALICIOUS

PDF

44.1 KB Created: 2020-08-18 16:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 532ef44e3f6e3bb718df795426b9d6cf SHA-1: ee7e5e2fcc60e5e17051781552d9731e3fc6d8f0 SHA-256: 170b38895c33574417fe7774efbc74bf575b8e2383111879fd0d9d92588c7c70
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a malicious redirector. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or engage in SEO abuse. No scripts were extracted, but the primary attack pattern involves directing users to external, potentially harmful, URLs.

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=failed+c%25C3%25B3+ngh%25C4%25A9a+l%25C3%25A0+g%25C3%25AC
    • http://files.collmanphotography.com/uploads/1/3/1/4/131409037/bikegosifalol-lejazowi-zufibabi.pdf
    • http://files.tradeshousemuseum.org/uploads/1/3/0/7/130775515/namew.pdf
    • http://files.thelightersideofme.com/uploads/1/3/1/6/131606690/1a4e2.pdf
    • http://posodun.ledphotoboothsales.com/uploads/1/3/1/4/131454106/vuvafoluwezebes.pdf
    • http://files.susannaloewy.org/uploads/1/3/2/6/132683357/sabezin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0447/2792/6937/files/autism_spectrum_disorders_foundations_characteristics_and_effective_strategies.pdf
    • https://cdn.shopify.com/s/files/1/0429/3325/6345/files/xakerawi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0477/2000/files/sivimanerufu.pdf
    • https://cdn.shopify.com/s/files/1/0436/1850/0765/files/92813913149.pdf
    • https://cdn.shopify.com/s/files/1/0438/8506/8456/files/pobowowukovitafufetugub.pdf
    • https://cdn.shopify.com/s/files/1/0433/7342/8890/files/maths_questions_for_class_6_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/3064/1826/files/macrosomia_acog_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3440/files/fifipalitizagej.pdf
    • https://cdn.shopify.com/s/files/1/0433/0379/6894/files/centrifugal_blower_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0434/3015/0296/files/jutatudoxeti.pdf
    • https://cdn.shopify.com/s/files/1/0431/9975/8497/files/iron_carbide_phase_diagram_explanation.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_off0000676a.bin
1be567ee86ba615c314e1f92ae19ed19b7c31a0f91034ebd8008d2e31ac71bdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x676A 5444 bytes
font_01_sfnt_off00007911.bin
17cac17bb253ce59b7279749bbf5606bfb140c0319215f2c744a111494dde7a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7911 13252 bytes

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