Malicious PDF — malware analysis report

Static analysis result for SHA-256 862626bd939ac0de…

MALICIOUS

PDF

43.7 KB Created: 2020-08-18 14:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 865a0537686628cb5c20569fb25ba255 SHA-1: d681072a7bc3de2862a848d4d2f7be7821cd4471 SHA-256: 862626bd939ac0deb819da500dfc07bcf5194c14f8b340197d88a29572442ba1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector infrastructure, indicating an attempt to lead the user to a harmful site. The document body, though heavily obfuscated, contains the same URL, reinforcing the malicious intent. The presence of numerous external links, many pointing to benign Shopify URLs, suggests a link farm or SEO manipulation tactic to disguise the malicious redirector.

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=biology+project+on+human+heart+pdf
    • http://tifaw.upperskagitlibraryfoundation.org/uploads/1/3/1/4/131482976/1235173.pdf
    • http://poxinib.wileychemistry.com/uploads/1/3/0/8/130814328/575dc.pdf
    • http://files.fhwellness-ca.com/uploads/1/3/1/4/131453214/suxazivujugi.pdf
    • http://files.rosesrags.net/uploads/1/3/1/4/131407194/sekidefuwip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/9014/0581/files/38902325907.pdf
    • https://cdn.shopify.com/s/files/1/0437/5838/7349/files/bible_nkjv.pdf
    • https://cdn.shopify.com/s/files/1/0440/5297/1685/files/recette_de_cuisine_algrienne_ramadan.pdf
    • https://cdn.shopify.com/s/files/1/0434/3290/2806/files/44438280107.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/15778938906.pdf
    • https://cdn.shopify.com/s/files/1/0436/1856/6306/files/debusa.pdf
    • https://cdn.shopify.com/s/files/1/0451/1278/7109/files/electronic_devices_and_circuits_by_jb_gupta_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/7792/6040/files/xapetelanomodase.pdf
    • https://cdn.shopify.com/s/files/1/0434/2353/1158/files/baned.pdf
    • https://cdn.shopify.com/s/files/1/0436/8403/6761/files/70929492999.pdf
    • https://cdn.shopify.com/s/files/1/0435/2779/8943/files/oxford_bookworms_library_stage_2_the_jungle_book.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_off00006053.bin
b765dd2f7079862c85d6bbc3a97638a5d4097b859a808b713f67ec12850a13a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6053 5500 bytes
font_01_sfnt_off000072df.bin
fb9e1678ae77b904b7eb0bcfb81df1f78c45c0adb62c53ee392840c91dae0763		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72DF 9680 bytes
font_02_sfnt_off000093fa.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93FA 4324 bytes

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