Malicious PDF — malware analysis report

Static analysis result for SHA-256 452e11058b6d980e…

MALICIOUS

PDF

38.3 KB Created: 2020-08-07 19:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 309abbccba4f64e1a606f053b4bfbe52 SHA-1: f51a8a28908fab92bd4e7342cd3210bf5fab686a SHA-256: 452e11058b6d980e0ed593eef87e730c7f2a7fc2eb43be14fb700a2ae1a887d5
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with heuristics indicating it's part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a malicious intent to lure users to harmful sites. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the extensive use of external links points towards a content-based lure or SEO manipulation tactic.

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.ru/pify?keyword=cristianismo+puro+e+simples+pdf+download
    • http://files.yenway.com/uploads/1/3/0/8/130874433/e3c4f0466c7.pdf
    • http://riwatulu.gbnfootball.com/uploads/1/3/1/6/131637254/sidokitutubite_xaginoxax_vevetokazowiba.pdf
    • http://files.patriciagodden.com/uploads/1/3/1/4/131483019/5adf2.pdf
    • http://files.dankcityclothing.com/uploads/1/3/2/7/132710711/31152ca1.pdf
    • http://files.ribcityshootout.com/uploads/1/3/1/4/131436978/b2989f0c.pdf
    • https://cdn.shopify.com/s/files/1/0433/4957/3784/files/lunajaxuberodelogusabugim.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92702877098.pdf
    • https://cdn.shopify.com/s/files/1/0435/2029/5064/files/bosedi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9275/4076/files/maneloje.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lojuxefututa.pdf
    • https://cdn.shopify.com/s/files/1/0438/4158/5314/files/yaseen_shareef_read_online.pdf
    • https://cdn.shopify.com/s/files/1/0433/9551/4535/files/a_level_psychology_aqa.pdf
    • https://cdn.shopify.com/s/files/1/0430/6314/8695/files/wukemikuzenojoles.pdf
    • https://cdn.shopify.com/s/files/1/0436/9262/1978/files/64506628939.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6349/files/dozufeb.pdf
    • https://cdn.shopify.com/s/files/1/0427/7246/3772/files/7255791601.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mevebetivegukubevam.pdf
    • https://cdn.shopify.com/s/files/1/0439/1885/2264/files/migulesunato.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005622.bin
6206b42741e6c4857f2534ec6f98a27f69196443cc7c2a6654f5759ef7ce14db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5622 5184 bytes
font_01_sfnt_off000067b9.bin
b2f11005edcd32c7c7031ce41854f4207e84635664bc676e954755eaae8cc9fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67B9 10644 bytes

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