Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7dae8306c4db88f…

MALICIOUS

PDF

41.7 KB Created: 2020-10-29 15:47:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2fb21cbb0b3854746642b74d1bf2f90a SHA-1: 1022212b2bb0a177fb75ff23fa23033a05bc7d33 SHA-256: a7dae8306c4db88fea9ebc97a5daefb965c942d56d4cf6a104b86570dbb2c52e
94 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating a redirector link to known malicious infrastructure. The embedded URL, https://cctraff.ru/aws?keyword=biology+trivia+with+answers, is the primary indicator of malicious intent, likely serving as a lure to a phishing or malware distribution site. No scripts were extracted, but the presence of the malicious URL strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/aws?keyword=biology+trivia+with+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368984/normal_5f88425c892d5.pdfIn PDF document text
    • https://barofabilis.weebly.com/uploads/1/3/2/7/132712093/zuwoxikulusofijuwe.pdfIn PDF document text
    • https://nabisipiguges.weebly.com/uploads/1/3/4/4/134432296/masatus_gimotobuzopilal_guwijuwi_lugiwijiwin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368979/normal_5f8e21ed34146.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384644/normal_5f9484acf283c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368751/normal_5f8c598a6b462.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/847e32ed-f3fe-48d6-af71-3f1b8a1ac449/2007_mitsubishi_endeavor_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f23cf992-a040-4b7f-b803-92aa833a333c/vshare_ios_8._3_no_jailbreak.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/40779872818.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/zuvixepevojirutib.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_off000062c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62C7 5248 bytes
SHA-256: e8894c540fe424f64531c654b94ccb10009c67d18b056249c9a0ac47ba272728
font_01_sfnt_off000074bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74BD 10708 bytes
SHA-256: 4eeea4a8e6960599b9cf3c4d076071660848ac3b0b009a9a4a6749e3cbe4ed49