Malicious PDF — malware analysis report

Static analysis result for SHA-256 62a7fd7f62de7028…

MALICIOUS

PDF

51.7 KB Created: 2020-08-17 12:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 959d1abe6c4662d7058fa17b78893ea4 SHA-1: dcf18fbad2fe358a1d6583db99b95a639e20b658 SHA-256: 62a7fd7f62de702881690c847daa18080c7eabc57d1089137a0ae2997e0f0cb6
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to link farms and redirectors. One critical heuristic identified links to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=alias+grace+margaret+atwood+pdf'. The document body, though heavily obfuscated, contains references to the same URL and other PDF files hosted on Shopify, suggesting a coordinated effort to drive traffic to potentially malicious content. The ML classifier strongly indicates maliciousness.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=alias+grace+margaret+atwood+pdf
    • http://basumuw.camptczew.com/uploads/1/3/2/7/132740623/296f4d.pdf
    • http://jixorit.penrithvalleyfigureskatingclub.com/uploads/1/3/1/3/131383483/8727023.pdf
    • http://sipudaneg.jhmartist.com/uploads/1/3/0/8/130874493/dd8fec6bd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7150/4537/files/5065881383.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5511/files/valuzune.pdf
    • https://cdn.shopify.com/s/files/1/0439/7321/4366/files/sheep_brain_labeled_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0428/4337/3735/files/windwalker_monk_wowhead_guide.pdf
    • https://cdn.shopify.com/s/files/1/0440/7666/2949/files/75126424900.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3541/files/bible_quiz_questions_and_answers_from_matthew_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0431/6128/8868/files/41047057354.pdf
    • https://cdn.shopify.com/s/files/1/0431/6587/6379/files/zagijomoxilakigamakanufi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6101/0842/files/infosec_labs_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/0628/0355/files/crculos_armnicos_guitarra.pdf
    • https://cdn.shopify.com/s/files/1/0436/9219/5993/files/16492267166.pdf
    • https://cdn.shopify.com/s/files/1/0438/2756/0598/files/difference_between_univariate_bivariate_and_multivariate_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0441/1647/6056/files/expository_apologetics_voddie_baucham.pdf
    • https://cdn.shopify.com/s/files/1/0433/6238/6079/files/33609320572.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008c0f.bin
49daa7b60101a8e6604192df4e46755255d749bab5b7fef7f7fce69d2bc088fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C0F 5556 bytes
font_01_sfnt_off00009ee5.bin
daf1c3273c6933cef0a2bf76256c4bea41d68e5d8e95c067681edcad037124f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EE5 10364 bytes

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