Malicious PDF — malware analysis report

Static analysis result for SHA-256 0793fb3c59c39f1e…

MALICIOUS

PDF

49.7 KB Created: 2020-10-15 04:39:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ef065977764b93fa2ac790fe2f84f8e0 SHA-1: 1354fc604ba339d6ffbec3d1a1a178c81dbda21b SHA-256: 0793fb3c59c39f1e6e01bec415547ccd81de29f9f9c24379913d85c1cb09459d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to known malicious redirectors or link farms, indicating a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings suggest the document's primary purpose is to redirect users to malicious content.

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://ggtraff.ru/123?keyword=pubg+mobile+cheat+codes+apk In PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/e9ff54.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/041aa.pdfIn PDF document text
    • https://vuzevarezevarot.weebly.com/uploads/1/3/0/7/130740461/3556218.pdfIn PDF document text
    • https://fanavepuru.weebly.com/uploads/1/3/1/8/131871984/3359054.pdfIn PDF document text
    • https://pituluwo.weebly.com/uploads/1/3/1/4/131437949/toridulubaxugof.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/wijigomofiweb_lotitosede_jukis_dirum.pdfIn PDF document text
    • https://dejuxowiku.weebly.com/uploads/1/3/0/7/130738850/8623408.pdfIn PDF document text
    • https://melegejisud.weebly.com/uploads/1/3/1/3/131379421/9211530.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/lonevu.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/budup_muruketika_befusijago.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/4709/8803/files/fda_nutrition_label_guidelines_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/7797/0341/files/terraria_calamity_mod_legendary_weapons.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/8733/2253/files/ncsu_cvm_spring_break_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4957/3784/files/50455111316.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1229/1264/files/gezilekitik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/7414/5441/files/mrs_claus_dress_girl.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6050/0901/files/animated_stories_from_the_new_testament.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7121/2193/files/aapka_colors_free_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2933/0082/files/fokazeradurimi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000082e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82E0 5596 bytes
SHA-256: b59959aecefb1e7ae01a157a5da8416554e09afca418836fe3523b1da6405e22
font_01_sfnt_off000095b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95B6 10540 bytes
SHA-256: 7b7956272426bfcce5d666f5c0b47a0d10a9e6b1f7161c52408859038c22a1a9

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