Malicious PDF — malware analysis report

Static analysis result for SHA-256 791ae5f71a41d97f…

MALICIOUS

PDF

46.2 KB Created: 2020-09-05 17:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 91e2284909ec57e89e0b963a8362be03 SHA-1: 7e82ded79dd151c96c67a646ab6286e173ad5ee3 SHA-256: 791ae5f71a41d97f202702b09a7dd98cd05c557b74320e1e61d769d141c450f6
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=streaming+music+player+apk In 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/1/0432/4953/3088/files/gofasiteran.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4143/2487/files/26674690794.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0445/4517/9807/files/app_store_iphone_7_plus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7587/0613/files/74653457194.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4855/0050/files/dorajavelazedodokadolelim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/39098199453.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/6622/0695/files/jonupoxenanoki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jufozigazagapuji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8374/9781/files/lowes_canandaigua_ny.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/29c71c_24f82ca5a25d4675b047d4acf444e376.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/158fb9_5a3a4879317a4067acde027ed7163e08.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_48fe4696d326493eaa4a37a99cf9180e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_ce4376c3d3a342f391a01856abd891d4.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/dcf9ad_620f587f7bae4bf98a93d6fa5149a187.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5525/9560/files/52777453203.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7958/2374/files/zifik.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_off00007453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7453 5524 bytes
SHA-256: 220eba7a56db21d65c9351c99d6bfdf3b3a89d40a88b444a85e9f739291fde77
font_01_sfnt_off00008711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8711 10852 bytes
SHA-256: f4f0330ed3b7378daa965d1c6758c16aa58fe57fab1ddcba330c0ef9b97b1397

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