Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f4851472acaf26…

MALICIOUS

PDF

33.3 KB Created: 2020-11-01 18:59:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3ae1445de7211e428f661e5ddc797d9c SHA-1: 35bffc6ef22bac32146103aeccb954e5d6224aa7 SHA-256: 64f4851472acaf26550f11c76b7803a60883d9bd3acaef7c7fec918e82e78b1c
124 Risk Score

Malware Insights

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

The PDF document contains embedded links that are disguised as an answer key for an algebra quiz. One of the primary links, 'https://cctraff.ru/aws?keyword=chapter+4+quiz+2+algebra+1+answer+key', is identified as a malicious redirector. The document's structure and numerous links to disposable hosting services suggest a phishing or scam attempt, likely to lead users to malicious content or malware. No scripts were extracted, but the presence of malicious links is sufficient evidence of 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 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.
  • 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=chapter+4+quiz+2+algebra+1+answer+key In PDF document text
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/924405cb8ca788a.pdfIn PDF document text
    • https://xexovelez.weebly.com/uploads/1/3/0/8/130813416/mefosakivuv_bujopabad.pdfIn PDF document text
    • https://bozofuki.weebly.com/uploads/1/3/4/3/134322044/murikutesitufiso.pdfIn PDF document text
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/nunobavupig.pdfIn PDF document text
    • https://muvisodujop.weebly.com/uploads/1/3/4/3/134358588/xegadevugaboj_purolirerilonu_vawozureniguwup_nederilemurabip.pdfIn PDF document text
    • https://nagifinapu.weebly.com/uploads/1/3/2/6/132696111/javejawidugu.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/1/0488/0469/2133/files/pixel_gun_3d_gem_generator_no_human_verification.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/jetonuligog.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/51434229185.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/gubilodifuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/0857/3607/files/brothers_in_arms_2_mod_apk_revdl.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1825/5510/files/dd_5e_dm_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/93571756842.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/vanilla_twilight_piano_sheet_music.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_off00004288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4288 5832 bytes
SHA-256: ca05613688e07a561e7da4567ce3e8ebc82dd2da4c7a5da58f66104100cf0338
font_01_sfnt_off0000567f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x567F 9908 bytes
SHA-256: 2d4da1cd7f09243fd087631ec8012b55a4b7b11175ade12e5d3ad80b22380379

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