Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c3cedddf953c201…

MALICIOUS

PDF

39.2 KB Created: 2020-08-03 17:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9319c2eb72e386ee991c1f46d03477db SHA-1: d59f73d5fe8b405fdb6c7a21edf909ce80c73fa7 SHA-256: 5c3cedddf953c201ef7b70d04756cf085d48eec8029b727a23e7af91816770a9
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though partially obfuscated, contains text and URLs that align with SEO spam or phishing lures, aiming to direct users to potentially harmful 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.ru/pify?keyword=for+since+ever+never+just+already+yet+exercises+pdf
    • http://files.ruthworkssf.com/uploads/1/3/1/4/131452783/3a9a7a692d0fb.pdf
    • http://files.tevfikmuratyildirim.com/uploads/1/3/1/3/131379591/d2ded2fb00f.pdf
    • http://files.1800cuttree.net/uploads/1/3/0/9/130969357/lakomeralefev.pdf
    • http://files.puterbaughcollection.com/uploads/1/3/0/8/130874050/mevarisopetar.pdf
    • http://files.lizziemahoneypaintings.net/uploads/1/3/2/3/132303068/871172.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4406/8773/files/tojuregalena.pdf
    • https://cdn.shopify.com/s/files/1/0431/2917/6232/files/dusobomuxodomo.pdf
    • https://cdn.shopify.com/s/files/1/0438/8120/1819/files/22829780639.pdf
    • https://cdn.shopify.com/s/files/1/0431/3694/2231/files/ratuvuwemakibewuranisezod.pdf
    • https://cdn.shopify.com/s/files/1/0432/0637/7633/files/free_mblex_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/9240/1573/files/82132696349.pdf
    • https://cdn.shopify.com/s/files/1/0439/0833/3736/files/25533674156.pdf
    • https://cdn.shopify.com/s/files/1/0431/0879/4530/files/46454932443.pdf
    • https://cdn.shopify.com/s/files/1/0433/4940/9960/files/9896971685.pdf
    • https://cdn.shopify.com/s/files/1/0431/2619/4333/files/xemop.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5825/files/kiwavevuxuwuxugavogumos.pdf
    • https://cdn.shopify.com/s/files/1/0429/7061/1861/files/jovere.pdf
    • https://cdn.shopify.com/s/files/1/0434/0459/1255/files/50031851357.pdf
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/161883292.pdf
    • https://cdn.shopify.com/s/files/1/0433/8784/6806/files/beran.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_off000059ad.bin
1d8a6066eccf9298ba1bb4511833ae87dfbea99fe0b5db37de559af6a7af776c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59AD 5412 bytes
font_01_sfnt_off00006c3f.bin
e45fd158089011b1d69399a27b468a169c85b3f5218e49fdf16ffc3d11e683a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C3F 10244 bytes

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