Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7146e0b9a55a91…

MALICIOUS

PDF

46.8 KB Created: 2020-10-27 01:05:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 879a7b444e211b3aa265329632dda69a SHA-1: 941a1640134c7f05890b02bd22be8064e2d248e4 SHA-256: 5c7146e0b9a55a91d075e29659d403da799e6861394b560ce612b32dac79bd4c
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that is also flagged as a malicious redirector. The presence of numerous links suggests an attempt to direct users to external, potentially harmful, websites for further exploitation.

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://cctraff.ru/123?keyword=sodium+valence+electrons+ion
    • https://cdn-cms.f-static.net/uploads/4368736/normal_5f8d153d2334f.pdf
    • https://cdn-cms.f-static.net/uploads/4374698/normal_5f8dbdb35b221.pdf
    • https://cdn-cms.f-static.net/uploads/4368467/normal_5f881b8142ab3.pdf
    • https://votawaxamudogop.weebly.com/uploads/1/3/4/4/134400347/xologatexarabekiwix.pdf
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/muvedipufetubisofelo.pdf
    • https://manoxumumaxu.weebly.com/uploads/1/3/4/4/134472756/8940214.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0495/4996/7527/files/52370541597.pdf
    • https://cdn.shopify.com/s/files/1/0433/4659/1903/files/negiwerudoburog.pdf
    • https://cdn.shopify.com/s/files/1/0496/1445/4937/files/towivugulozonuzijerejis.pdf
    • https://s3.amazonaws.com/gupuso/lajenodizomezubibuf.pdf
    • https://s3.amazonaws.com/xefejevife/canto_nuevo_camino_neocatecumenal_2016.pdf
    • https://s3.amazonaws.com/wilugugo/deficiencia_de_vitamina_b12_causas.pdf
    • https://s3.amazonaws.com/titugome/breeam_new_construction_2018.pdf
    • https://s3.amazonaws.com/sisaxu/mirewofumanujasabusiv.pdf
    • https://uploads.strikinglycdn.com/files/f723ffe0-7767-4650-aff1-fa68b6695b7e/zuroxoge.pdf
    • https://uploads.strikinglycdn.com/files/59e5f84d-10e8-40f6-9b81-d552fb5ec6dc/wilewazegagagolekes.pdf
    • https://cdn.shopify.com/s/files/1/0486/2931/7790/files/angles_in_a_triangle_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0499/7051/2040/files/asus_maximus_iv_extreme_manual.pdf
    • https://cdn.shopify.com/s/files/1/0485/9510/8000/files/ximer.pdf
    • https://cdn.shopify.com/s/files/1/0496/1189/9044/files/ukulele_songs_2016.pdf
    • https://cdn.shopify.com/s/files/1/0501/9035/2565/files/jaxigulob.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007872.bin
2dfb79ab850f4819b74b7ee43c84b277024752ad1a1b7c1e5bd513cc9b633a56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7872 5248 bytes
font_01_sfnt_off00008a2d.bin
dec02d72335f82a775d61191e79a183569c2f9f767e21d2db542ccc6dc7da9fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A2D 10368 bytes

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