Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d12f0709beb1e5…

MALICIOUS

PDF

40.9 KB Created: 2020-08-23 00:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 728ec8436be86a269fc750076dbb53c6 SHA-1: ba03b54c914ed79e148342d4ead7ef7a5095abe7 SHA-256: 75d12f0709beb1e58578c147ededdb47d29dd54c808db47136af4b0618ab6e8d
154 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 potentially malicious redirector infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to ttraff.ru, which is known for malicious redirection. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a mass external link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly indicates 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.ru/pify?keyword=metformin+hcl+vs+metformin+xr
    • http://files.gwrsd.org/uploads/1/3/0/7/130776031/poxodopefivepozoba.pdf
    • http://jixalimun.berkshireartsacademy.com/uploads/1/3/0/9/130969336/2325771.pdf
    • http://komegu.edwardmoak.com/uploads/1/3/2/8/132814930/jedezozu.pdf
    • http://binebapeb.esprit-de-core.com/uploads/1/3/1/6/131606343/rukol.pdf
    • http://saxugo.southwestharbormaine.org/uploads/1/3/0/8/130814328/a6208f4f9f04.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0457/4923/9964/files/ayogya_bgm_ringtone.pdf
    • https://cdn.shopify.com/s/files/1/0434/8978/8069/files/difference_between_assembly_language_and_machine_language.pdf
    • https://cdn.shopify.com/s/files/1/0465/2384/2718/files/cannon_fodder_pc_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0435/2638/9912/files/86061949671.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mitev.pdf
    • https://cdn.shopify.com/s/files/1/0429/4764/1510/files/funding_for_small_business_startup.pdf
    • https://cdn.shopify.com/s/files/1/0440/3822/6085/files/dragon_s_dogma_stat_growth.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/8094815901.pdf
    • https://cdn.shopify.com/s/files/1/0434/3683/4981/files/51006491023.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/linearna_algebra_i_analiticka_geometrija.pdf
    • https://cdn.shopify.com/s/files/1/0433/6877/5841/files/al_mughni_ibn_qudamah_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1536/5020/files/lemarin.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_off000061bf.bin
73a0a2c38bad820c7b91bc88f7127ded54288cc1573b5c8975b6ce65ab4468f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61BF 5044 bytes
font_01_sfnt_off000072d6.bin
db09f6c75f990e9a1b529e979bc39e61a164644338f2928effc4a605a25671b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72D6 10564 bytes

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