Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c96f800f6228920…

MALICIOUS

PDF

47.0 KB Created: 2020-10-04 02:40:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f947d63dfa32478cfa281027644e133e SHA-1: f810465400a34de62a64fa4eee2c1207a98f25d6 SHA-256: 5c96f800f6228920b6320141c9003da832571701db628fc7df6da89110d41b61
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. The ML classifier strongly indicated maliciousness. The embedded URL 'https://cctraff.ru/pify?keyword=1971+ahsme+questions' is a clear indicator of a malicious redirector, likely used to funnel victims to phishing or malware sites.

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://cctraff.ru/pify?keyword=1971+ahsme+questions In PDF document text
    • http://files.chspjcp.net/uploads/1/3/1/3/131383541/negunazibaves.pdfIn PDF document text
    • http://files.middletonchoirs.com/uploads/1/3/1/4/131406498/xevifud.pdfIn PDF document text
    • http://files.yoursalwayspdx.com/uploads/1/3/1/6/131606373/xovudeteve.pdfIn PDF document text
    • http://sisizox.artsanimalsandawakenings.com/uploads/1/3/0/7/130776208/xubadizepazob.pdfIn PDF document text
    • http://files.waysideresources.com/uploads/1/3/1/4/131407687/nonelosovabimo-gotolax.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/1/0479/1484/4327/files/saturn_in_libra_4th_house.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9626/7168/files/magnetism_worksheet_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/4063/5542/files/el_almohadon_de_plumas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/7529/1286/files/51642501119.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9436/0735/files/map_of_central_asia_and_india.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6042/8439/files/vawemasizifetabonuxola.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4420/8789/files/29064749210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e721eae-5692-4de7-9bb7-16e1dca6a8ce/bapalapitoxivu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5187036e-e96b-4705-b9f2-4883fe433145/12302499256.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4db006d8-0056-437f-bb8a-04a8a1617aa1/nowopirisozoxeref.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_off00006d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D56 5000 bytes
SHA-256: 6d35a42bb639fa9084a49580e6d4d97a3596521a73ce385de1049f58fe882a22
font_01_sfnt_off00007e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E3E 10076 bytes
SHA-256: 26081ea90c8fac50e30d12e2c1512fc80669d8ffd107cba909e126b9bed2e89e
font_02_sfnt_off0000a0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA0A7 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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