Malicious PDF — malware analysis report

Static analysis result for SHA-256 484f887fa2f44105…

MALICIOUS

PDF

43.3 KB Created: 2020-08-11 18:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 8a968eed79c469bbec59feadea86fb4e SHA-1: 675df2436662a814980537e3f0bd8c4a159fd383 SHA-256: 484f887fa2f44105f25a9191bb67393b508c401ab9355e4eafcd3fcc05b339ff
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=bessel+s+inequality+proof+pdf In PDF document text
    • http://files.gardenspotrentals.net/uploads/1/3/2/6/132681938/finefenusavat.pdfIn PDF document text
    • http://files.stuartkraut.com/uploads/1/3/1/1/131164081/5661619.pdfIn PDF document text
    • http://gedox.blackacrefarmstead.com/uploads/1/3/1/3/131383483/ed5fbdf3.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/1/0432/7132/3804/files/gate_2020_syllabus_for_civil_engineering_iit_delhi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5813/3152/files/71608130339.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/7115/8949/files/zezesefedaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6889/8966/files/27411388785.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3197/0471/files/44657139421.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6546/6270/files/lowes_hammond_la.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0416/5285/files/telugu_christian_songs_piano_chords.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9928/2845/files/bizozuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2204/0731/files/59002340757.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8168/6439/files/59209220588.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/26443777516.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5543/0309/files/58193623821.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000540e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x540E 5312 bytes
SHA-256: 8a1ec32114ae1da4f97cef57af82dc260592d165681b800b0eb2a1ffbdd7eed2
font_01_sfnt_off0000662f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x662F 10592 bytes
SHA-256: 3c44cdec9fb24a14d0f7bac957053f991033da814dcb3507dfe46756c4651ffa
font_02_sfnt_off00008a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A96 16232 bytes
SHA-256: e59c990f576b71408684ddc68cb9f97bd65e9f46a78f1bcc16031e3866adb2bd

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