Malicious PDF — malware analysis report

Static analysis result for SHA-256 23aef72cb6560a35…

MALICIOUS

PDF

46.2 KB Created: 2020-11-01 00:23:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-10
MD5: a8acd5127e46451ac34c9967ef9dce0c SHA-1: 2464b15c3bd449171d9e1832086a596e6b231bd4 SHA-256: 23aef72cb6560a35e54bdd13069092314de01f2fb96467d6509b3ec2c63fef68
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.me/123?keyword=mc813ll%252Fa+hard+drive+replacement In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373997/normal_5f8b4b8466f63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_5f87095ec4961.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367302/normal_5f873deee649c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378170/normal_5f8d2b21dc43d.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00007208.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00007208.bin)
    • https://cdn.shopify.com/s/files/1/0496/4260/2645/files/garbage_truck_song_scott_pilgrim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1144/8729/files/98451553181.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8755/3213/files/tagofaresil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8099/7269/files/manual_sewergems_v8i_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/mopirexawofa.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/12665330879.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/7838/3282/files/kanaxaroranezeropeno.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8717/6902/files/xavepazezafarejabaven.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/0775/2343/files/46549886585.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/4067/3444/files/68568183295.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 extracted file (font_00_sfnt_off00007208.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7208 5644 bytes
SHA-256: 76a4c589d4410d076800bc3de5c6b7b476e3a12f344b0fc9b9d86baa8da4ad1d
font_01_sfnt_off00008536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8536 11680 bytes
SHA-256: cba87b2d8b8ccda4001b1b08d5a9fdac3ad4d07a6b3db19f626b50e57de730e5