Malicious PDF — malware analysis report

Static analysis result for SHA-256 8315fcc26609b93a…

MALICIOUS

PDF

61.5 KB Created: 2020-08-09 06:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4fda9409abb6e7ef85b3f918e7a3ca8d SHA-1: 22d6a711202a466d7c7a8aa6ac4577ec47b72331 SHA-256: 8315fcc26609b93a50b3a92c30da1b79c2892373ea6fa7be504ed70035132b6a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that point to a known malicious redirector, which is further confirmed by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure for a PDF related to autism and the Denver method. The presence of numerous external PDF links, many pointing to Shopify domains, suggests a link farm or SEO manipulation tactic to distribute malicious content. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive document title and malicious URLs.

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.cc/pify?keyword=metodo+denver+autismo+livro+pdf
    • http://dagomone.speedkiteboard.com/uploads/1/3/0/9/130969744/tekumujepul.pdf
    • http://files.kelmaraircraftsales.com/uploads/1/3/1/6/131636969/dc72e13e56cc.pdf
    • http://files.mrscooke.com/uploads/1/3/0/7/130776720/096e1.pdf
    • http://files.hollywoodindian.com/uploads/1/3/0/7/130739833/getemaso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6803/0102/files/raymer_aircraft_design.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jokixud.pdf
    • https://cdn.shopify.com/s/files/1/0429/4891/9450/files/neopet_rainbow_pool.pdf
    • https://cdn.shopify.com/s/files/1/0432/6447/5299/files/wupiseg.pdf
    • https://cdn.shopify.com/s/files/1/0438/2674/1405/files/bitogexudagutowenepilala.pdf
    • https://cdn.shopify.com/s/files/1/0435/2904/4119/files/ccsp_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/0124/2022/files/lenotip.pdf
    • https://cdn.shopify.com/s/files/1/0430/7252/0352/files/tufexipemofewumafotexuxon.pdf
    • https://cdn.shopify.com/s/files/1/0435/2940/4567/files/xalebazakasabafowafa.pdf
    • https://cdn.shopify.com/s/files/1/0434/1619/1125/files/47953338850.pdf
    • https://cdn.shopify.com/s/files/1/0446/6167/0051/files/cervicofacial_actinomycosis.pdf
    • https://cdn.shopify.com/s/files/1/0432/0067/5995/files/15946056834.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_off0000af9b.bin
40aa3e4ec9048bbe3f57c39505eb8694d7494278c9244432611f3688ed682d11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9B 5252 bytes
font_01_sfnt_off0000c172.bin
dec04eee67bea004cab111882a0b2e4f0371753c415eec1e87030e10e740f61f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC172 11208 bytes

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