Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f6782d60fa876d…

MALICIOUS

PDF

41.6 KB Created: 2020-08-04 16:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f0d03bc17ceb8f26d18640cd42bc398 SHA-1: 6c4d7fd19df9d4fa79befb0985d81dffc65043ef SHA-256: 89f6782d60fa876d4b401012ae6f01f316c4cb049b729acd782eec11077f7d49
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The primary malicious URL identified is https://ttraff.ru/pify?keyword=beginner+new+headway+pdf. The document body, though heavily obfuscated, also contains this URL and other links pointing to Shopify domains, suggesting a link farm or redirection scheme. The ML classifier strongly supports the malicious verdict.

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=beginner+new+headway+pdf
    • http://files.groupj.net/uploads/1/3/1/6/131606094/3ed6f5dfc.pdf
    • http://files.fincalossuenos.com/uploads/1/3/2/8/132815190/rozegorejija.pdf
    • http://files.homecade.com/uploads/1/3/1/1/131163667/fujavuposukomo-nofubax-mojemalup.pdf
    • http://files.arrowheadchoirs.com/uploads/1/3/1/6/131637240/215c806.pdf
    • http://files.s2ccinema.com/uploads/1/3/2/6/132695734/pawotas-ribokinuwoji-sorotamepolu.pdf
    • https://cdn.shopify.com/s/files/1/0428/6201/8716/files/30861810698.pdf
    • https://cdn.shopify.com/s/files/1/0432/8760/9497/files/talomobaj.pdf
    • https://cdn.shopify.com/s/files/1/0429/4619/9711/files/12377419514.pdf
    • https://cdn.shopify.com/s/files/1/0429/4007/2092/files/sedinobobolesapur.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/moxudenolaruxorurafugi.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/gazotexafumikoxo.pdf
    • https://cdn.shopify.com/s/files/1/0434/9244/2264/files/5951467455.pdf
    • https://cdn.shopify.com/s/files/1/0434/0331/3308/files/mudobavinobigitudamuketo.pdf
    • https://cdn.shopify.com/s/files/1/0430/2385/9873/files/betakerelarituk.pdf
    • https://cdn.shopify.com/s/files/1/0438/0118/2370/files/pumaxenetajegezito.pdf
    • https://cdn.shopify.com/s/files/1/0434/7166/7352/files/lupibejo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7924/files/80141033955.pdf
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/bawakijugudiwafuwizowi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7526/2869/files/xadafavarigiviwadosadav.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70278744099.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_off000062b7.bin
e35772fe5aca69b9332ed872c40ec9d6b160e3a367134f59678ce5159a366a58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62B7 5336 bytes
font_01_sfnt_off000074fa.bin
fecfb265996cff6646fb8bd1ce3f009d1a3be2a36b6d187a3fd4c0fc3a357a2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74FA 10788 bytes

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