Malicious PDF — malware analysis report

Static analysis result for SHA-256 8085962a751219ba…

MALICIOUS

PDF

52.2 KB Created: 2020-09-03 04:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 806139f1c670987b808559cac4e5e1c0 SHA-1: e0597b5af3e3fcb5d3554fde061712d3cfe057ab SHA-256: 8085962a751219ba1d1d897364eac68ec48717a53108b8868f7e9da45415fda7
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a PDF related to exercises, likely a lure for SEO poisoning. The presence of numerous links to external PDFs further supports the SEO poisoning and link farm hypothesis.

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.com/wix?keyword=adverbios+de+lugar+ejercicios+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/0df15e_55a40641317c42a68aa5e18dcfbeb8e4.pdf
    • https://static.usrfiles.com/ugd/0c4177_fb8ed37e49d347e0b8ab0f117fdca79e.pdf
    • https://static.usrfiles.com/ugd/03ae60_175ed12c297244418316f3930258bc1d.pdf
    • https://static.usrfiles.com/ugd/3b7182_2ca577c8d888430fab3ccc7bf13b8307.pdf
    • https://static.usrfiles.com/ugd/c3f88d_de6804cdd0ae464e9da06c69cecec9d7.pdf
    • https://static.usrfiles.com/ugd/b8c837_23de9b25a7244af8b20cabae8e05d6d0.pdf
    • https://static.usrfiles.com/ugd/cc03df_2de50500e23f4ed18668c2961f26498a.pdf
    • https://static.usrfiles.com/ugd/b8c837_857fd19f984e4c0fa702c7e3211b0246.pdf
    • https://static.usrfiles.com/ugd/e2c250_da0f603b23064dc1964da3e55527985b.pdf
    • https://cdn.shopify.com/s/files/1/0428/5412/1635/files/nebokumujexobenafoxojeda.pdf
    • https://cdn.shopify.com/s/files/1/0429/5789/7882/files/morbark_chipper_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/6599/7472/files/kril_tsuroth_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0432/0978/5499/files/zaxitag.pdf
    • https://cdn.shopify.com/s/files/1/0447/9208/6685/files/tipos_de_aditivos_para_el_concreto.pdf
    • https://cdn.shopify.com/s/files/1/0436/3150/9664/files/66450123280.pdf
    • https://cdn.shopify.com/s/files/1/0431/1682/2692/files/vijedinanegu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/jubexonamix.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/72922230273.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_off0000819e.bin
dbf1c2779f2127bac4523e7bde91094f765207e55e3a7d8be9749dd655d4d9b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x819E 5588 bytes
font_01_sfnt_off000094b7.bin
97c736b6a1ee3db1eb131734096ed14457c83e9b81958a18057ce85d52c7712e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94B7 14904 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.