Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64b316e7064035f…

MALICIOUS

PDF

53.1 KB Created: 2020-10-28 07:16:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 524c17e2d8631085d42e33a2fdb5892a SHA-1: 5b5101ed060e3b4cb21e2b13a7d952c95e212a14 SHA-256: a64b316e7064035f86be5ed890b14b5c057978aa89a9e17153061c69f574e77d
192 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://gettraff.ru/strik?keyword=achilles+atr+sport+2+245%252F40r19 In PDF document text
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/804025.pdfIn PDF document text
    • https://jotuxopa.weebly.com/uploads/1/3/4/2/134265841/zifosisadilimaxixa.pdfIn PDF document text
    • https://finivoxub.weebly.com/uploads/1/3/4/3/134387593/fepuli-poxiwitaja.pdfIn PDF document text
    • https://zewubonorow.weebly.com/uploads/1/3/1/3/131398185/fd841.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/5083825.pdfIn PDF document text
    • https://wusiparopebabo.weebly.com/uploads/1/3/4/5/134505529/xepewemajupe_sudanilena_vojuke_nitop.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/1/0498/7994/1278/files/inline_electric_fuel_pump_autozone.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8070/6967/files/remuxerilijupolanobidu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c95d9d6-98a2-41cb-bf6b-bcb6eba816b6/rimojexepepo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40bce11d-497d-429f-89c0-44d5166dc3c6/11012719021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0d4fec7-9265-4c0b-a83e-5fba873c7f15/randall_d_knight_physics_for_scientists_and_engineers_4th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2210/4222/files/mighty_med_cast_now.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5898/6645/files/vokilogalopajanafizi.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/vereinfachter_antrag_auf_lohnsteuerermigung_2019_anlage_kinder.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/assonance_and_alliteration_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/cat_s_cradle_kurt_vonnegut.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/alelos_multiplos.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_off00007388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7388 5420 bytes
SHA-256: 7f77f846db6a18697237fe91e12c8021aac1bda38d79c5e96a183d8135b0d9c6
font_01_sfnt_off0000860b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x860B 16368 bytes
SHA-256: 38f2865a387c48ac5ad74ed2544aef450d70e6d9e5250168f6e8fca63c59bcfc
font_02_sfnt_off0000b8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E2 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34