Malicious PDF — malware analysis report

Static analysis result for SHA-256 4761916c702c97e8…

MALICIOUS

PDF

64.5 KB Created: 2020-10-17 08:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7b9d8431cb2a3fbc3a8e4bb9b80f425b SHA-1: 55b6c378f79b62c6377e358c5b4c3ba57703fdce SHA-256: 4761916c702c97e86ec89075e1701f0b99f0149a6fb762bc478a6add1adcde25
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ggtraff.ru, which is likely used to host or proxy further malicious content. The document body, though heavily obfuscated, contains the URL and keywords suggesting a lure for users searching for a 'Delcos 1000 manual pdf'. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent.

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://ggtraff.ru/123?keyword=delcos+1000+manual+pdf In PDF document text
    • https://mamunazeve.weebly.com/uploads/1/3/0/8/130814121/7348c3d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369640/normal_5f8a2fba8c0aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f8868a6af6f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366308/normal_5f87e244275e8.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/1/0497/5008/1690/files/synthesis_and_decomposition_reactions_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/8213/6734/files/adab_al_mufrad_kalamullah.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/4839/4663/files/69715122917.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/3326/4806/files/gadewifetumizod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2828/2529/files/pujewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10ad7dfd-f2da-4984-ad2c-a97862f94b5b/vafudapijoxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c2cb0f5-9491-49cf-a002-04cc88994776/28926136227.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/7481/8726/files/android_wear_apk_old_version.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8282/3333/files/24198549118.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4355/1392/files/acolyte_training_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2639/0946/files/dewodavep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21b5e5a0-bb4b-480a-87fe-c46558debeee/vikugerumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f742634-f5f7-4490-a144-14b5c7328549/52488861949.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54f85cf6-8650-45ed-a319-f76289d67b4c/college_algebra_julie_miller_2nd_edition.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_off0000bc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC35 5400 bytes
SHA-256: 22743f46b52745879a6c7ddae814ba6d3a39d88ac7f8d5a288c946d6f123d76a
font_01_sfnt_off0000ce7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7E 11164 bytes
SHA-256: d38a10207c46452a854848d85409b8b1df543c99131f563d335169a139e125f2

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