Malicious PDF — malware analysis report

Static analysis result for SHA-256 72307abb88bd5aaa…

MALICIOUS

PDF

42.4 KB Created: 2020-08-04 19:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3af2a20b1f28e14bcb42dd814b5a9bd8 SHA-1: a24ded42f7319e6d9431836ba5ad1a050ee4954d SHA-256: 72307abb88bd5aaa8fe532404b03fb2d418d30d35983cf608ffc0f6ee859202c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to Shopify domains, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://ttraff.com/pify?keyword=antrenmanlarla+matematik+4.+g%25C3%25BCn+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and appears to be a lure for users searching for specific PDF content. The ML classifier also strongly indicated maliciousness.

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=antrenmanlarla+matematik+4.+g%25C3%25BCn+pdf
    • http://files.broadwaykennels.com/uploads/1/3/1/3/131380343/55f64.pdf
    • http://files.tasteoftherunway.com/uploads/1/3/1/4/131453348/4959666.pdf
    • http://files.smyfl.org/uploads/1/3/1/3/131378771/bapomiv.pdf
    • http://files.tophatdesigns.net/uploads/1/3/2/3/132302868/totexobalozini.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/3564/8409/files/zexuxutabisomusubajakaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/2336/7335/files/rakamejafutaxilitinati.pdf
    • https://cdn.shopify.com/s/files/1/0434/8634/7414/files/13449154293.pdf
    • https://cdn.shopify.com/s/files/1/0428/7240/6179/files/22387065374.pdf
    • https://cdn.shopify.com/s/files/1/0432/1116/1768/files/8797325354.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/33971068516.pdf
    • https://cdn.shopify.com/s/files/1/0437/4695/1319/files/agenda_2020_escolar_2020_para_imprimir.pdf
    • https://cdn.shopify.com/s/files/1/0431/1220/2389/files/puwenisogijexugu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7100/5082/files/70857261686.pdf
    • https://cdn.shopify.com/s/files/1/0431/2878/3002/files/vabiraluxurijipisowo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1704/3111/files/19834584594.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0076/files/windwalker_monk_pvp_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/1216/1685/files/the_history_of_love_nicole_krauss.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_off00005ce7.bin
c7cce7ead0a60bace63d8ee59391005f8b300ccf649f86f504752af9b20b0033		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CE7 5476 bytes
font_01_sfnt_off00006f48.bin
4ccae2fab1a774e1a82ecd77f77e41fa800e25d796c4eba923edcce9599b52d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F48 14540 bytes

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