Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc455851f0e60b9b…

MALICIOUS

PDF

48.0 KB Created: 2020-07-31 06:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08e76287c370f66458e1bb8119e086ee SHA-1: 68d9330618344a3f0e44f6ef240f5847ccbe0042 SHA-256: bc455851f0e60b9bd79c91ea32a8b0734f935cf545c6128e81e658f7499d8ea2
152 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Shopify domains, which is characteristic of a link farm designed to manipulate search engine results. One of the primary links, https://ttraff.ru/pify?keyword=new+kind+of+automated+storage+and+retrieval+system+asrs+pdf, is identified as a malicious redirector. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is used for malicious redirection.

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=new+kind+of+automated+storage+and+retrieval+system+asrs+pdf
    • http://files.chestnuthillonline.org/uploads/1/3/0/7/130775734/61745659f.pdf
    • http://files.gemenvironmental.org/uploads/1/3/0/7/130775806/19ebae8.pdf
    • http://files.artofsnowone.com/uploads/1/3/0/7/130776828/wojajinif.pdf
    • http://files.boomboombrazil.com/uploads/1/3/1/8/131856569/soresidatiwi.pdf
    • http://files.themedigap.shop/uploads/1/3/2/6/132682802/gasanu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8184/files/94542573798.pdf
    • https://cdn.shopify.com/s/files/1/0430/6203/4589/files/58154046162.pdf
    • https://cdn.shopify.com/s/files/1/0435/4555/9189/files/rusewinisago.pdf
    • https://cdn.shopify.com/s/files/1/0430/3834/3322/files/pizebolemexadijidedi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4704/files/fajulusubitaka.pdf
    • https://cdn.shopify.com/s/files/1/0438/4977/7312/files/dakoxiwepade.pdf
    • https://cdn.shopify.com/s/files/1/0428/3750/8252/files/vetiremivolamarali.pdf
    • https://cdn.shopify.com/s/files/1/0432/9547/3822/files/musuvupasejowel.pdf
    • https://cdn.shopify.com/s/files/1/0431/4926/3004/files/sukutijaje.pdf
    • https://cdn.shopify.com/s/files/1/0434/2602/1527/files/basodopadiwine.pdf
    • https://cdn.shopify.com/s/files/1/0437/9839/7085/files/47299443814.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wulusiwebope.pdf
    • https://cdn.shopify.com/s/files/1/0431/3802/3581/files/gunibabeko.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_off00007c54.bin
dd51e8265d6bdff399de39fc05264f9a53b5b3b10abd1ff7594c3d37a4e22e22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C54 5532 bytes
font_01_sfnt_off00008f2f.bin
4c687d0340aa984495869e88e714e3bd74f685e18523f0223ef7dd635de54b6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F2F 10112 bytes

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