Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ce8152ae149b49c…

MALICIOUS

PDF

64.4 KB Created: 2020-09-16 22:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f6b760f3ac662075b47b7fa29f51619 SHA-1: b97ef17f3a32dd6b7f52904d7da24511c07bd01f SHA-256: 7ce8152ae149b49ca2ff08748f3cd283354470cf7b0b34179f8148e7b24b868b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document functions as a link farm, containing numerous links to external resources. One of these links, https://ttraff.me/wix?keyword=osrs+surprise+exam+answers, is identified as a malicious redirector, indicating a potential phishing or malware distribution attempt. The document's structure and the presence of a malicious redirector suggest it is intended to lure users to harmful sites, likely as part of a broader phishing campaign.

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://ttraff.me/wix?keyword=osrs+surprise+exam+answers
    • http://kudiw.andrenebonner.com/uploads/1/3/0/8/130873995/db2e4c07103c05.pdf
    • http://files.charmedimsure.com.au/uploads/1/3/2/6/132683088/76059.pdf
    • http://napazam.thorvaldurorn.com/uploads/1/3/0/8/130873995/2036442.pdf
    • http://files.marcelastrasdas.com/uploads/1/3/2/7/132740260/875de3ac792b7.pdf
    • http://nowutof.threetimesluckyband.com/uploads/1/3/0/8/130814010/8555756.pdf
    • http://kujadomop.dmrfarms.com/uploads/1/3/2/3/132302921/3289043.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3654/0056/files/raindrop_prelude_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0434/5623/3638/files/avon_online_brochure.pdf
    • https://cdn.shopify.com/s/files/1/0428/4638/8380/files/19991842130.pdf
    • https://30870d2a-c68e-46a5-9f15-d9a0571be0c1.filesusr.com/ugd/1e52da_566d752bd6e845c5925936b09043f77a.pdf?index=true
    • https://95301361-cdd8-447d-bdcb-c7b0700b316b.filesusr.com/ugd/4bb894_49fdb4abb8f7480b9a9e74ae35d06d97.pdf?index=true
    • https://e075acfc-4bd7-4066-ab27-cf32ded3eedf.filesusr.com/ugd/dec231_46a1e2ae8a374feb93e473d81f7d97ac.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8f5.bin
db1d34f6890fd26212edc15226cfad08934ca335ea67178a6a42534ea7afb6a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F5 5120 bytes
font_01_sfnt_off0000ca5a.bin
452b95e51e08ce67ad2987a659aa5b0643c1afb9f41ee3c5104098c5dd67ea98		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5A 13476 bytes

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