Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7540f187955c3ad…

MALICIOUS

PDF

37.9 KB Created: 2020-08-24 18:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: beb4c986519295d1d5027c1f670ad02c SHA-1: bd17e07475ced6b166a9acdccf3d7cc4c48fe176 SHA-256: a7540f187955c3ada62126c0ab7b2d10b1517f37f9888f6f9d62dbc5a1fbcf44
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/pify?keyword=cyber+hunter+apk+pure In PDF document text
    • http://files.fruklas.com/uploads/1/3/1/4/131437341/vatufolad-lurunakanex-jirifimelune.pdfIn PDF document text
    • http://files.thatsojill.com/uploads/1/3/1/3/131380042/9667621.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/1/0431/8858/4605/files/92260119708.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3167/4535/files/administrao_pblica_portuguesa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0235/6124/files/aashto_t193_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1024/3230/files/belof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7188/9815/files/kesobonir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1471/6572/files/44749761195.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9162/4096/files/94324104466.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4246/4163/files/fedukugufifimutagimofekiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/949986333.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5770/8185/files/89626970785.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_off00005187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5187 4908 bytes
SHA-256: 472ccacd5893899f20a58e2098eb64273db36cf01b5407424aa89075ce779632
font_01_sfnt_off00006234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6234 12980 bytes
SHA-256: b158f7ee4c107a12ea4365b2f2561105583f2201193c629678e4c5d8b6f07fb0