Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5a9b7af216c8e1…

MALICIOUS

PDF

44.4 KB Created: 2020-08-21 13:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 993a1e9e7b1010d910ea4b1970c88dd5 SHA-1: 6119816b95b7905571df97aa8f564c6694330019 SHA-256: 8e5a9b7af216c8e17e766a3d0463569dea44cbddf8e92fab02347e19d1c1af78
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.cc/pify?keyword=amy%2527+s+answering+machine+script In PDF document text
    • http://files.oneburgh.com/uploads/1/3/1/4/131453715/bbc64.pdfIn PDF document text
    • http://files.stjepanpepiskuric.com/uploads/1/3/0/9/130969075/3af1e5029b9bcc.pdfIn PDF document text
    • http://piwobepi.anatomyalchemy.com/uploads/1/3/1/3/131398294/basajut.pdfIn PDF document text
    • http://gowefib.thorsonpto.org/uploads/1/3/2/6/132696067/9dc36ecc91.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/1/0431/6450/0122/files/fewenu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1488/0405/files/pastel_goth_fashion_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9165/6864/files/wugaruzuvez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/69930130382.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7325/7118/files/54112757606.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3128/1314/files/15096706295.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/crop_evapotranspiration.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4914/7803/files/53138980417.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5956/9055/files/7878031196.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8127/7342/files/aarum_kaanathe_song_maango.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_off00006e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E50 5532 bytes
SHA-256: f51c6873713c2726154d2ccba02e6c5e424b46cbe4a0ea0ebdb2baf609d05f20
font_01_sfnt_off00008110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8110 10424 bytes
SHA-256: 2a9e2aa61dbe67646548967a1be54e860d4fdcacf17713c3ead629528f1a6442