Malicious PDF — malware analysis report

Static analysis result for SHA-256 525a55c133a760cb…

MALICIOUS

PDF

34.1 KB Created: 2020-09-18 00:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c990c46090e0fc06d446244a1e2957e7 SHA-1: 01c6bda2358d06234f03c77b07ca8dab5dc9a2ca SHA-256: 525a55c133a760cb58a190d1462a924d728d22463bb42d65895dca71e5f1cbe7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. Additionally, a PDF link farm heuristic indicates the document is designed to host numerous external PDF links, likely for SEO manipulation or to distribute further malicious content. The ML classifier strongly supports the malicious verdict.

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://ttraff.me/wix?keyword=ap+statistics+chapter+5+test+answer+key
    • http://files.braznstudio.com/uploads/1/3/1/6/131607043/penos.pdf
    • http://files.susannaclasby.com/uploads/1/3/0/7/130740210/615ec3a70d568.pdf
    • http://files.armenianstudentconvention.ca/uploads/1/3/0/8/130874189/7463231.pdf
    • http://sinijap.occmedfordcs.com/uploads/1/3/1/4/131437930/retoriragano.pdf
    • http://files.apartmrome.com/uploads/1/3/0/9/130969172/tufetodizekew_xozetebetar_mojele_nakonijamez.pdf
    • http://files.nerdwizardartist.com/uploads/1/3/1/8/131871687/subinuwitunozani.pdf
    • http://sutogog.psnsupps.com/uploads/1/3/1/4/131438539/pafalipebavefajasef.pdf
    • https://cdn.shopify.com/s/files/1/0429/6025/7177/files/physical_properties_of_transition_metals_chemguide.pdf
    • https://cdn.shopify.com/s/files/1/0431/8514/3965/files/bujusuwagum.pdf
    • https://cdn.shopify.com/s/files/1/0427/8714/3839/files/analogy_vocabulary.pdf
    • https://cdn.shopify.com/s/files/1/0431/9212/3554/files/hcf_and_lcm_worksheet_ks3_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/5162/2305/files/vewisi.pdf
    • https://cdn.shopify.com/s/files/1/0461/9668/6997/files/276191378.pdf
    • https://cdn.shopify.com/s/files/1/0432/3134/6856/files/battle_of_midway_movie.pdf
    • https://cdn.shopify.com/s/files/1/0434/1510/9794/files/adding_linear_expressions_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0460/1590/5951/files/74587715878.pdf
    • 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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048d0.bin
1a84049890d51250cb84aa338eba171993ba76016a8a8edd227980213db237cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x48D0 5360 bytes
font_01_sfnt_off00005b22.bin
5d16e22ac95fa9698c044b907a74c6cfb5bdeca3a299fc8df86369af8509a080
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B22 9496 bytes