Malicious PDF — malware analysis report

Static analysis result for SHA-256 be5fa0d7dd9ad40b…

MALICIOUS

PDF

167.4 KB Created: 2020-08-12 09:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24077fea5810ccc2d2a65035d008b8d1 SHA-1: f4ffa895118c27ffaa78d783e61b4411616bd904 SHA-256: be5fa0d7dd9ad40b4b5998da810b221b426378f3ae47b705dfaf8741b438427d
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a critical heuristic firing indicating a malicious redirector link to 'https://ttraff.ru/pify?keyword=centesimus+annus+summary+pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to contain the malicious URL. This suggests the primary purpose is to lure the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=centesimus+annus+summary+pdf
    • http://files.ryankitley.com/uploads/1/3/1/3/131384169/jozud_dozuj.pdf
    • http://banejiv.integrityhouseinspections.com/uploads/1/3/1/4/131407511/1994082.pdf
    • http://files.wearecommunityfirst.org/uploads/1/3/1/3/131383860/5aba7d.pdf
    • https://cdn.shopify.com/s/files/1/0428/0510/0707/files/birds_name_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0428/8918/3398/files/dulidawa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nisexabidubukov.pdf
    • https://cdn.shopify.com/s/files/1/0429/9695/7343/files/11779541945.pdf
    • https://cdn.shopify.com/s/files/1/0430/2798/8634/files/netokufifamavajoka.pdf
    • https://cdn.shopify.com/s/files/1/0431/0210/9856/files/19365578630.pdf
    • https://cdn.shopify.com/s/files/1/0432/0601/7186/files/73932526365.pdf
    • https://cdn.shopify.com/s/files/1/0435/6128/7839/files/ronoropijeraxezuves.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/zetoruzenude.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/miduwalikusab.pdf
    • https://cdn.shopify.com/s/files/1/0438/6711/1584/files/22532103924.pdf
    • https://cdn.shopify.com/s/files/1/0437/9177/7952/files/a_modern_approach_to_classical_guitar.pdf
    • https://cdn.shopify.com/s/files/1/0432/2190/9662/files/natepebepefemimupepatet.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_off00025b69.bin
3ad13475bd0562e6c05a70e54c48939df1d015ca3e4bd5c80cd9c1908699f7e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x25B69 5160 bytes
font_01_sfnt_off00026ce1.bin
e0994dcd57b3e5892838c297f326190fd46f8d8b7eb3aa563c83a963b4a81192
pdf-font-stream PDF embedded font (sfnt) at offset 0x26CE1 10324 bytes