Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0945a13da47b65f…

MALICIOUS

PDF

43.4 KB Created: 2020-09-13 03:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: df1d144a34c92cbc7069a1170139db90 SHA-1: 49774bc7d18a1b9335cf49b65ecd63819a417bc2 SHA-256: f0945a13da47b65f1e89e0fee2e73f17d7027f0f30ef71259d718b618e4b7f6c
184 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific redirector URL, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious. The presence of numerous embedded links, including one pointing to known malicious redirector infrastructure, suggests the document is designed to lead users to harmful sites.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.link/pify?keyword=nickelback+free+ringtones In PDF document text
    • http://files.weruntheforest.co.nz/uploads/1/3/1/4/131454692/refugotam.pdfIn PDF document text
    • http://files.mabarnes.com/uploads/1/3/1/4/131438784/gevefusepaka-bevuzib-karinaxibive.pdfIn PDF document text
    • http://jugefawed.lenoratrussell.com/uploads/1/3/1/4/131414661/6579635.pdfIn PDF document text
    • http://kugazo.rachelelizabethmyers.com/uploads/1/3/1/3/131379530/f9d53aebd759ca.pdfIn PDF document text
    • http://files.frontrunnersri.com/uploads/1/3/1/8/131856479/puvupob-toponasefep-ladawew-sibolivusavofo.pdfIn PDF document text
    • http://files.beclitvan.com/uploads/1/3/2/6/132696500/7063422e34d.pdfIn PDF document text
    • http://vogeni.pctinfo.org/uploads/1/3/0/8/130874063/3301004.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8058/1274/files/rorapijitokawomupemis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4048/0155/files/15504908032.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3504/1685/files/blank_coupon_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4115/1386/files/81970142772.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_b4c44efe4ad84f37af5feb168a81ae37.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/735189_0bd1547d25114404aac197e9d0e29815.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/de9003_40191b09be7b43318b620da887e2e369.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/81ef4b_033a1ad274794f5293de72b70ac49e28.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/29c71c_d9feb4a89361400f8a7b60f97c2f33dd.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BD3 5220 bytes
SHA-256: 8ecf13a03f12acc89ff8db8d223f2a92f68b2a19da0d53780d46545d4f076166
font_01_sfnt_off00007db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DB6 10344 bytes
SHA-256: 6d2bd8e18dd23be3d606dd4818fe3fe27c38da8b0ba0980493c5046680c686e9

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