Malicious PDF — malware analysis report

Static analysis result for SHA-256 a860e1dc6e752504…

MALICIOUS

PDF

48.7 KB Created: 2020-10-06 12:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: a8fe191d80f9c4275bee859fada38f7c SHA-1: 8f52680816261199cee77bf67e3bce6e17385c59 SHA-256: a860e1dc6e752504a73ebf370c64eb23bc81d5143d0870dc88a10d406d2c1433
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=ugg+return+policy+covid+19 In PDF document text
    • https://site-1036772.mozfiles.com/files/1036772/50970031221.pdfIn PDF document text
    • https://site-1043534.mozfiles.com/files/1043534/rufafotigomod.pdfIn PDF document text
    • https://site-1039730.mozfiles.com/files/1039730/31819413696.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/1/0481/5375/5799/files/ffbe_jp_mod_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/5739/9976/files/pasture_lease_agreement_nebraska.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9270/0062/files/minecraft_sheet_music.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6578/9602/files/how_to_cook_neck_bones_and_beans.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2738/5501/files/rezo_a_san_judas_tadeo_para_la_salud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/4579/7026/files/kipetazixa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8878/2236/files/jet_bandsaw_guide_blocks.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/7916/6873/files/historia_de_mexico_1_tercer_semestre_bachillerato.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/0952/0028/files/rogezumawilimoliti.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9864/5404/files/threat_permits_unauthorized_data_disclosure.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8673/1681/files/kivojasawofapinixipisuwi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7026/1914/files/gabixiko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7801/7443/files/49785689525.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_off00007f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F89 5216 bytes
SHA-256: 1beb2581869e5e7b27d40f85463ecb9c76abbd0fa4bc2442c4db8f25fac5c69f
font_01_sfnt_off0000916d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x916D 10752 bytes
SHA-256: 77a70e8c52a3a5b65b2fb5d50eea2e9f329f63a71a2350c5d6b941c5f5800c97

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