Malicious PDF — malware analysis report

Static analysis result for SHA-256 760795c4c81516af…

MALICIOUS

PDF

41.3 KB Created: 2020-08-21 10:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24a91b563a6454c7c638364dddaca4ef SHA-1: 13fff59773daa58e3a63e8d057e1bf7ec563dbf9 SHA-256: 760795c4c81516af154ed32b14c76cabb5ad03f82c61cfb4ee3093dd82788c85
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain the URL https://ttraff.cc/pify?keyword=adjetivos+possessivos+em+ingles+exercicios+pdf, which likely leads to further malicious content or phishing pages. The presence of a link farm and a high ML classifier score indicate a malicious intent to redirect users to potentially harmful sites.

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=adjetivos+possessivos+em+ingles+exercicios+pdf
    • http://files.davidwhitneybuilding.com/uploads/1/3/0/7/130775429/6547895.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9823/5289/files/vmware_fusion_10_key.pdf
    • https://cdn.shopify.com/s/files/1/0434/6891/4838/files/hp_officejet_4500_g510g_m.pdf
    • https://cdn.shopify.com/s/files/1/0430/7438/8119/files/sulepanulubipufebenolufet.pdf
    • https://cdn.shopify.com/s/files/1/0431/5981/4306/files/vascular_anatomy_of_the_brain.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7924/files/toxaritigewuwiruwov.pdf
    • https://cdn.shopify.com/s/files/1/0429/8817/5513/files/27282414153.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57790570823.pdf
    • https://cdn.shopify.com/s/files/1/0435/5679/8615/files/vufelazaropoxojawelez.pdf
    • https://cdn.shopify.com/s/files/1/0451/8959/5287/files/dolphin_emulator_android_xbox_one_controller.pdf
    • https://cdn.shopify.com/s/files/1/0428/9386/9223/files/73473035370.pdf
    • https://cdn.shopify.com/s/files/1/0431/4464/2716/files/diablo_3_demon_hunter_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/1241/5911/files/92969970444.pdf
    • https://cdn.shopify.com/s/files/1/0429/1949/3785/files/37102574828.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_off00006218.bin
202dc829af3e14c71724aa857110f46897fc8b0f5e3b03e6a8100981755b1dfa
pdf-font-stream PDF embedded font (sfnt) at offset 0x6218 5460 bytes
font_01_sfnt_off000074aa.bin
cde0466808b520cad1052b5ed3c46a5130297a1ee50c6ba6c6a4cb429d73f5c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x74AA 10304 bytes