Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc048ff3283cefc…

MALICIOUS

PDF

57.3 KB Created: 2020-10-12 00:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f30928b4026671f1b8fb92eb02f08e5e SHA-1: 831adfc95bb6bd86886fc32c55bfda380a643523 SHA-256: afc048ff3283cefc9015a941d8733611f204a13e042578bf3526d6aa79d2871a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL designed to lure users with a keyword related to 'calculadora de ecuaciones exponenciales'. The ML classifier strongly indicates maliciousness, and the presence of a large number of external PDF links suggests a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains the malicious URL.

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://gettraff.ru/strik?keyword=calculadora+de+ecuaciones+exponenciales In PDF document text
    • https://site-1042740.mozfiles.com/files/1042740/33476685653.pdfIn PDF document text
    • https://site-1040354.mozfiles.com/files/1040354/nimodupujomurakixazura.pdfIn PDF document text
    • https://site-1043843.mozfiles.com/files/1043843/dosevogazarepibivurajil.pdfIn PDF document text
    • https://site-1041684.mozfiles.com/files/1041684/45049948388.pdfIn PDF document text
    • https://site-1043121.mozfiles.com/files/1043121/54447790578.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/1/0266/9448/4147/files/spider_man_homecoming_google_drive_link.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4058/7431/files/furogidujuwuzojonaworolu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4895/9142/files/tatinututotenu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/kenworth_exhaust_scr_def_service_required.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/7497/2567/files/73844416060.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0490/0791/9271/files/lab_report_rubric.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7897/8210/files/kewirikigafa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/8520/5156/files/letise.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8597/8018/files/heroes_of_camelot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1463/8744/files/disney_frozen_castle_puzzle.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3658/5377/files/bloomfield_school_nm.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/4692/9052/files/13204316271.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/7894/2360/files/92340414209.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B5E 5040 bytes
SHA-256: a4318fa97c986e98b013fc320e983036ebcdd217c2affbbddc0f66455cf1b081
font_01_sfnt_off00008c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C88 17164 bytes
SHA-256: 02bff94f13db570baa47f56a88b7cb9050e4477bf3881ef530e17ea1b26fb3c7
font_02_sfnt_off0000c0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D3 16080 bytes
SHA-256: e3d583ca8131484f6b7e9991674a220a85ec8466745261d702706f92b0246cac

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