Malicious PDF — malware analysis report

Static analysis result for SHA-256 799a45dff8d3b471…

MALICIOUS

PDF

71.5 KB Created: 2020-08-23 01:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f7a6d5c1c4ffa0471330ab8f6dc57f2 SHA-1: dbba43f85eb49cd5cb42be188965f3846f63e455 SHA-256: 799a45dff8d3b471bc306aba3b8972a29701c778105c3fc61faf3dee5c42883f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=base+form+simple+past+past+participle+list'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, many of which are hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. These factors indicate a likely attempt to lure users to malicious infrastructure.

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=base+form+simple+past+past+participle+list
    • http://nonex.rosinakhan.com/uploads/1/3/1/4/131438044/4351726.pdf
    • http://files.detailsstrategicadvisors.com/uploads/1/3/1/4/131406831/a68a669.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/9558/8005/files/70678639711.pdf
    • https://cdn.shopify.com/s/files/1/0431/6112/5013/files/60429185724.pdf
    • https://cdn.shopify.com/s/files/1/0430/5754/5365/files/gogusiwur.pdf
    • https://cdn.shopify.com/s/files/1/0436/8252/9445/files/vopevi.pdf
    • https://cdn.shopify.com/s/files/1/0437/8525/7112/files/sabijalukiweru.pdf
    • https://cdn.shopify.com/s/files/1/0428/7306/1532/files/88248568272.pdf
    • https://cdn.shopify.com/s/files/1/0431/8904/3358/files/kidutemunikunotonusigo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/77537857948.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/visaboxe.pdf
    • https://cdn.shopify.com/s/files/1/0429/1900/2268/files/school_annual_day_report_format.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9127/files/executive_summary_of_a_survey_report.pdf
    • https://cdn.shopify.com/s/files/1/0430/0704/9877/files/44944197597.pdf
    • https://cdn.shopify.com/s/files/1/0429/9309/0714/files/dotot.pdf
    • https://cdn.shopify.com/s/files/1/0437/7490/2430/files/13541672739.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1c6.bin
a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C6 2828 bytes
font_01_sfnt_off0000dbc0.bin
dd84ab9e8211b8d7c2c129e441efed7238cd0edfeaf26ccd53b02d0f16188385		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC0 5212 bytes
font_02_sfnt_off0000ed5e.bin
4834088a1cfddca3e48c4adefad7ead2aaed7eec68560ff6bd702a1f224d2e3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED5E 10180 bytes

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