Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc28819d0d75d388…

MALICIOUS

PDF

42.5 KB Created: 2020-08-08 04:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed1aee288394efcbac640273408423a3 SHA-1: cd626cd7d0ff39b801a09c1bf9ec8beec4e814ea SHA-256: fc28819d0d75d388030b632fba7a311c36e6eb69c1a0ba81da6def7299b2f639
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link to 'ttraff.com'. The document body, though heavily obfuscated, contains text that suggests a lure related to 'l express newspaper pdf'. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be directing users to malicious infrastructure via embedded links.

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=l+express+newspaper+pdf
    • http://files.kcorneliusimagesandmarketing.com/uploads/1/3/1/6/131637273/6192374.pdf
    • http://files.mtabenefitfund.org/uploads/1/3/1/3/131398129/vofewivevukupuz_toxepozener_rivefukujapul.pdf
    • http://files.reneoconnor.com/uploads/1/3/0/8/130813524/9356748.pdf
    • http://files.bosselitehockey.com/uploads/1/3/0/8/130814225/tewaxinoxopabuw.pdf
    • http://files.secure.server.name/uploads/1/3/1/8/131871535/5490143.pdf
    • https://cdn.shopify.com/s/files/1/0437/3993/8970/files/18488194429.pdf
    • https://cdn.shopify.com/s/files/1/0431/6459/8434/files/russian_english_bilingual_visual_dictionary_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/6844/8152/files/rajakavek.pdf
    • https://cdn.shopify.com/s/files/1/0431/3861/3415/files/11959342901.pdf
    • https://cdn.shopify.com/s/files/1/0427/9068/2783/files/doxezagodo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9635/8565/files/free_o_reilly_books.pdf
    • https://cdn.shopify.com/s/files/1/0430/8929/7568/files/phonics_beginning_sounds_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0435/3346/7808/files/55808602626.pdf
    • https://cdn.shopify.com/s/files/1/0437/5651/9585/files/north_carolina_durable_power_of_attorney.pdf
    • https://cdn.shopify.com/s/files/1/0431/3317/3927/files/regression_with_censored_data.pdf
    • https://cdn.shopify.com/s/files/1/0438/2857/6416/files/ziwuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/6980/8550/files/suxugax.pdf
    • https://cdn.shopify.com/s/files/1/0434/5063/0297/files/retrica_e_argumentao.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_off00006731.bin
174cfb235b193ed78a046d6233ba2ac6d7702dce75961300ccaf3826d3d0ddda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6731 5104 bytes
font_01_sfnt_off000078b6.bin
1b880f056902d6393b2980261027cd684563c7b7a170fb33aa6be2dae9f6dcd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78B6 10748 bytes

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