Malicious PDF — malware analysis report

Static analysis result for SHA-256 da874fad8a2c6b30…

MALICIOUS

PDF

71.3 KB Created: 2020-08-05 04:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d1397dced8d44843b7cb3e97acc6277 SHA-1: 5ebc11bb0e3370619e74a1b861ac232809a17543 SHA-256: da874fad8a2c6b30af255816b16c56173b0aa40d207373345aabbcf5b77508a0
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the `PDF_MALICIOUS_REDIRECTOR_LINK` heuristic. The document body, though heavily obfuscated, contains the URL `https://ttraff.ru/pify?keyword=business+plan+on+bakery+in+nigeria+pdf`, which is a known malicious redirector. The presence of numerous other PDF links further supports the SEO link farm 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=business+plan+on+bakery+in+nigeria+pdf
    • http://files.athleteinstincts.com/uploads/1/3/0/8/130814342/52f2c22b464.pdf
    • http://files.engrx.org/uploads/1/3/1/4/131437064/mulemudugifebuwal.pdf
    • http://files.infostationcorp.com/uploads/1/3/1/1/131164425/d5c36.pdf
    • http://files.matterzcollective.com/uploads/1/3/1/6/131606016/7e34081.pdf
    • http://fixaf.redd-i.com/uploads/1/3/1/3/131379578/begumesi-didomas.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/61447147187.pdf
    • https://cdn.shopify.com/s/files/1/0432/9072/2469/files/80641747059.pdf
    • https://cdn.shopify.com/s/files/1/0428/0595/2671/files/24572160374.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/itr_1_acknowledgement_form_2020_19.pdf
    • https://cdn.shopify.com/s/files/1/0433/9446/5948/files/liquify_tool_photoshop.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mobisibat.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gaxasukazojolivuf.pdf
    • https://cdn.shopify.com/s/files/1/0429/1434/9215/files/ginuxivekamolabelamon.pdf
    • https://cdn.shopify.com/s/files/1/0428/8466/1414/files/gaboputasozera.pdf
    • https://cdn.shopify.com/s/files/1/0436/9275/3049/files/the_dark_id.pdf
    • https://cdn.shopify.com/s/files/1/0433/2843/8427/files/gunipi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/the_westing_game_test.pdf
    • https://cdn.shopify.com/s/files/1/0434/2461/2509/files/lubunibererenob.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_off0000c94f.bin
f9836502616f8e52a4479b3119042a9d83d0d269d9ce437f1f4d532e32b8c65e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC94F 5564 bytes
font_01_sfnt_off0000dc60.bin
5d215a535fe412af41be6beb6f9ba4fb8bddc339c257483626b7011da47e8ac0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC60 16960 bytes

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