Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d44a3aea11de1e3…

MALICIOUS

PDF

35.7 KB Created: 2020-08-07 15:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3165ada71d37f7ce4ed599ef6cf9aa2 SHA-1: e48ca715979a97d63ea307b0406decfaf066c34b SHA-256: 5d44a3aea11de1e3725ab271325056cec55b7de2dac91b00c63eea87e416bb8e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded URLs, with one identified as a known malicious redirector. The presence of a large link farm suggests an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=cempaka+kuning+pdf
    • http://files.cathsquilting.com/uploads/1/3/0/9/130969192/kidevukokapifis-godipo-senowadirawir.pdf
    • http://files.covidchurchresources.com/uploads/1/3/0/8/130813667/rezolinajaka.pdf
    • http://files.beinsynch.com/uploads/1/3/0/9/130969372/7113184.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5847/0816/files/dunevevoganepi.pdf
    • https://cdn.shopify.com/s/files/1/0435/9385/9231/files/mcc_codes_usmc.pdf
    • https://cdn.shopify.com/s/files/1/0441/2702/7352/files/51475238405.pdf
    • https://cdn.shopify.com/s/files/1/0429/7375/7603/files/components_of_trustworthiness_in_qualitative_research.pdf
    • https://cdn.shopify.com/s/files/1/0431/4995/1138/files/goxis.pdf
    • https://cdn.shopify.com/s/files/1/0434/0344/4380/files/andhra_university_distance_education_notification_2020_20.pdf
    • https://cdn.shopify.com/s/files/1/0431/9327/0429/files/gifomubilisalunodewoxidil.pdf
    • https://cdn.shopify.com/s/files/1/0433/3892/4181/files/zuduloxirovobunu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2402/2680/files/70537085050.pdf
    • https://cdn.shopify.com/s/files/1/0438/7468/0987/files/nezozekok.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92399027362.pdf
    • https://cdn.shopify.com/s/files/1/0433/9322/0758/files/zumejimofi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6130/4728/files/bekidito.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_off00004f2c.bin
020539087abf849d0b80a1e1c244fada42d30c4c8ca3477a4b2bd9d7e3c65aae
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F2C 5024 bytes
font_01_sfnt_off00006039.bin
2e6c632f88bd453ffec82c02987a88d07f3f5a5552b143f71aa218c11f192192
pdf-font-stream PDF embedded font (sfnt) at offset 0x6039 9848 bytes