Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f34c9880414b155…

MALICIOUS

PDF

45.6 KB Created: 2020-10-07 04:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: eb11a3b8efa8ab25078d384b02a8a97f SHA-1: e4954ef771c211419e95cd8101989240181ea70f SHA-256: 2f34c9880414b1550adb07c5d18219c340d366c3763770643fd784d8ef25537d
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with heuristics indicating it's a link farm designed to redirect users to potentially malicious infrastructure. The presence of a redirector link and the ML classifier's high confidence score strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure.

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=what+is+the+best+rubik%2527s+cube+method In PDF document text
    • http://rodona.northcarolinajcl.org/uploads/1/3/1/4/131410939/padalo.pdfIn PDF document text
    • http://files.twigny.com/uploads/1/3/0/8/130874634/zutobapiwikurekujexo.pdfIn PDF document text
    • http://telur.tccoloradobaseball.com/uploads/1/3/1/3/131379844/f020eab4524e4b.pdfIn PDF document text
    • http://biwobi.unionchapelfwb.com/uploads/1/3/1/4/131483068/6158072.pdfIn PDF document text
    • http://repetedu.homeschoolbrew.com/uploads/1/3/0/8/130874030/3910324.pdfIn PDF document text
    • http://pupubokil.reliablelimoja.com/uploads/1/3/0/9/130969950/melekonavimulidovo.pdfIn PDF document text
    • http://sitol.bluesandcompany.com/uploads/1/3/0/7/130776262/pujemarutawurip_fukonagu_karojulunubu_suzejerijafawo.pdfIn PDF document text
    • http://files.elizabethdoylecarey.com/uploads/1/3/1/4/131453036/3054967.pdfIn PDF document text
    • http://kumujuv.mark-elliott.ca/uploads/1/3/0/7/130738971/garasurew.pdfIn PDF document text
    • http://files.ninelivestwine.com/uploads/1/3/0/8/130874629/vezik_gunefitotokek.pdfIn PDF document text
    • http://tobuxija.craftybrown.com/uploads/1/3/2/8/132814930/4133722.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7667/1895/files/19183648346.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0460/2504/8223/files/the_duck_song_2_parody.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8344/0036/files/kenmore_dishwasher_model_665_repair_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6635 5176 bytes
SHA-256: 08efa652a5d9ee9308a00f6430ac9be0710e5ca0d3eabd83683e10a627a73f45
font_01_sfnt_off000077d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77D3 10284 bytes
SHA-256: 4d5a1d63c960c8a3fcdb96e42901734b4e2e85f2deb17464dcc99f2e26ccbc6d
font_02_sfnt_off00009ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AE7 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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