Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d2c539ceb6f6626…

MALICIOUS

PDF

40.5 KB Created: 2020-10-07 00:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: db2ae7c248334a80ff85da48d6921dc4 SHA-1: d941c5c6e0f58a51b4ec635b0ee7555904d88b64 SHA-256: 7d2c539ceb6f6626ecefdd7dcebcbffce25a86473e97a765f43b33fabe0928cd
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to suspicious domains and are identified as part of a link farm. One critical heuristic indicates that PDF links lead to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The embedded content, though obfuscated, appears to be a lure for academic material, directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://ggtraff.ru/strik?keyword=introduction+to+psychology+james+kalat+11th+edition In PDF document text
    • http://nedevup.latorreholidays.com/uploads/1/3/1/8/131871899/7b9d80ddcac47.pdfIn PDF document text
    • http://gudaju.entertechgames.com/uploads/1/3/1/0/131070357/7270293.pdfIn PDF document text
    • http://velumote.accruemineralsinc.com/uploads/1/3/1/3/131379256/d271526604f419.pdfIn PDF document text
    • http://kiwibas.softechinc.net/uploads/1/3/1/4/131456363/noralaruras.pdfIn PDF document text
    • http://kokomu.missioncitygolf.com/uploads/1/3/2/6/132683071/5905015.pdfIn PDF document text
    • https://site-1036785.mozfiles.com/files/1036785/nibixoredalapavetagosafox.pdfIn PDF document text
    • https://site-1037846.mozfiles.com/files/1037846/kifabaxibavavuxan.pdfIn PDF document text
    • https://site-1042879.mozfiles.com/files/1042879/wedazusapudimumukakanipol.pdfIn PDF document text
    • https://site-1037840.mozfiles.com/files/1037840/47466217860.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/1/0484/9136/4502/files/blue_jay_point_trails.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/star_trek_dvd_cover.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/8280/1312/files/algebra_1_chapter_6_test.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6453/2900/files/my_family_story_badge_brownies.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5949/2517/files/sauder_shoal_creek_desk_assembly_instructions.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_off0000512d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x512D 5600 bytes
SHA-256: f31c52f48b19c0a3a9b904115b365d7fb3ac1acc5ec2a1bbc82066e7970f87f5
font_01_sfnt_off0000641c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x641C 10200 bytes
SHA-256: fb5649161a4469a25a96049796aeb7caab48ca6e7a054a50481cd934fe1644fd
font_02_sfnt_off000086e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86E2 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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