Malicious PDF — malware analysis report

Static analysis result for SHA-256 21450a827d03e616…

MALICIOUS

PDF

51.0 KB Created: 2020-08-07 19:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e89c8dbc7c76a2c4ed06f0c4a44060b8 SHA-1: 315e18a15fca1819ce3fab2674f73009e453e129 SHA-256: 21450a827d03e6162823795673e6f363d05665696982fa98e2c4be0e8c6c71b9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, forming a link farm. One of these links redirects to a known malicious domain (ttraff.com), suggesting a phishing or malware distribution attempt. The document body itself is heavily obfuscated and contains the malicious URL, further indicating its malicious intent. The presence of a link farm and a malicious redirector points towards SEO poisoning or a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=sch%25C3%25A9ma+de+proc%25C3%25A9d%25C3%25A9+de+fabrication+de+l+acide+sulfurique+pdf
    • http://files.shopdboutique.com/uploads/1/3/2/6/132696465/sukolurasijasexebix.pdf
    • http://files.chartistcollins.com/uploads/1/3/1/4/131406736/94ce667.pdf
    • http://files.dessertdesignsbygisela.com/uploads/1/3/0/7/130775404/pokafiruforisoxopu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4514/3207/files/87132046113.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bepojarovizezeba.pdf
    • https://cdn.shopify.com/s/files/1/0441/1126/5944/files/ielts_writing_task_1_academic_answer_sheet_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/0290/4222/files/suravovosizomixani.pdf
    • https://cdn.shopify.com/s/files/1/0431/0050/4217/files/topix_land_rover.pdf
    • https://cdn.shopify.com/s/files/1/0438/2579/1133/files/capoeira_fighter_3.pdf
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/20805919066.pdf
    • https://cdn.shopify.com/s/files/1/0431/0299/4586/files/rakudike.pdf
    • https://cdn.shopify.com/s/files/1/0431/1787/1255/files/fudupasuwab.pdf
    • https://cdn.shopify.com/s/files/1/0434/4738/6262/files/adjectives_and_adverbs_bungen.pdf
    • https://cdn.shopify.com/s/files/1/0432/8508/6374/files/benefits_of_technology_in_education.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062fd.bin
fd03e35dde805867f05d4ab07046252c365ab28d5455b472d3efc0a3cd55724e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62FD 5904 bytes
font_01_sfnt_off0000769b.bin
92449b4f1478ffe6d960beb8bc7de3b63666646ea455f2c6984257dcde416aed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x769B 10144 bytes
font_02_sfnt_off00009758.bin
6a7ddfb92b434b2c5d80b59fc5f77c3545465b5a5c4dc88dcbc03b0e04bad9c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9758 11060 bytes

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