Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c33addd86b62363…

MALICIOUS

PDF

45.9 KB Created: 2020-10-16 15:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: f13e2d6f9b8433d52085fdb10cb2a5e1 SHA-1: 5f9cdf0fadff30e376e5ba94d29b480d7a7555ba SHA-256: 1c33addd86b62363a34ad804a67c4eb77fb13acb5e4af6f3713bc427700c3814
194 Risk Score

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=math-aids+fractions+worksheet+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366969/normal_5f873f0570e26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371246/normal_5f894c425595b.pdfIn PDF document text
    • https://gonerogad.weebly.com/uploads/1/3/1/4/131438616/5554014.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/5473886.pdfIn PDF document text
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/powudawiwus_melur.pdfIn PDF document text
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/litozugaxuga.pdfIn PDF document text
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/worupetimeliwevozet.pdfIn PDF document text
    • https://wovasemuzusalej.weebly.com/uploads/1/3/1/6/131636629/sujemiliv-medozosezugijer.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/vemuwireti.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/d1ee3c84.pdfIn PDF document text
    • https://rimesozarabef.weebly.com/uploads/1/3/1/6/131607712/d91c2928fdfa0.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/lulodegoner.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/1/0428/4655/2227/files/kagelisusu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0472/2920/6693/files/wufufosabugubaxuxuja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/9328/5792/files/dezajeja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8154/6390/files/graphing_linear_and_nonlinear_equations_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7613/4082/files/stickman_war_hacked_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c6e4c41-c72d-41fe-bada-1baaf09b7842/26676969440.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1127cd22-3dd3-40f3-878e-21c1c129b130/mekika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b025a187-6949-4948-8bc1-1ef473017410/rabobokirobuxozig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c069265-34fb-4f1e-bf7a-d4ff26605b15/rowemin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff183aaf-e304-4141-ac82-b33c1715c160/segosikajavisex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51e118ea-639e-4d09-b038-aad51906c363/64364677084.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b783106-a5d7-4a83-8139-cc6533e1fc51/53250618733.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_off000074f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74F0 5272 bytes
SHA-256: 12b52953e91457c1558d33f7fb2099fe4a50ec4a3b7be39a4ca8271b119afd2e
font_01_sfnt_off000086f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86F0 10216 bytes
SHA-256: 8e158807de5673cdfbf95309da848ed9e3d1ead02a36c1cf4049176a1d85ef47