Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d173126bd5570f7…

MALICIOUS

PDF

47.1 KB Created: 2020-07-21 08:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c91e5d805458d0bc9ce468333fb20e5 SHA-1: 65a9913ef648852e0b9d92ed09d3defdf7f46155 SHA-256: 9d173126bd5570f7284ad2c81f6ad2f17b0a2b82b31bf0e1e8d16cd2f7c2c4dc
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic firing for linking to known malicious redirector infrastructure. Additionally, it contains a mass external PDF link farm, with many links pointing to Shopify domains, suggesting an attempt at SEO manipulation or a large-scale distribution effort. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily truncated and unreadable, limiting further analysis of the specific lure.

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.com/wb?keyword=livro%20teoria%20da%20aprendizagem%20significativa%20pdf
    • http://files.industrysitesonline.com/uploads/1/3/1/6/131606563/jiveditipawazu.pdf
    • http://files.macabrecinema.com/uploads/1/3/0/8/130813461/bumuw.pdf
    • http://files.discoveryourpurpose.net/uploads/1/3/0/8/130813782/9900887.pdf
    • http://files.meccadance.com/uploads/1/3/1/1/131163634/8602183.pdf
    • http://files.tbsadalumassoc.com/uploads/1/3/1/1/131164157/6249215.pdf
    • https://cdn.shopify.com/s/files/1/0433/1474/1413/files/jorujofe.pdf
    • https://cdn.shopify.com/s/files/1/0431/2412/9946/files/nelosox.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/94774846458.pdf
    • https://ralowigi.files.wordpress.com/2020/07/mogigopov.pdf
    • https://busedoza.files.wordpress.com/2020/07/besozuwif.pdf
    • https://jumosor.files.wordpress.com/2020/06/75615660592.pdf
    • https://vitasikog.files.wordpress.com/2020/07/54899927352.pdf
    • https://cdn.shopify.com/s/files/1/0434/8212/0357/files/vebobidulafik.pdf
    • https://cdn.shopify.com/s/files/1/0430/5331/8298/files/30756099543.pdf
    • https://cdn.shopify.com/s/files/1/0428/8980/5983/files/batatibipeviruv.pdf
    • https://cdn.shopify.com/s/files/1/0430/8280/9508/files/figelebojaletuparegugupa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9848/9503/files/25206546590.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1064/files/tefameje.pdf
    • https://cdn.shopify.com/s/files/1/0437/5989/4682/files/nefajuwululipox.pdf
    • https://cdn.shopify.com/s/files/1/0428/8161/3987/files/68875165175.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/
    • https://cdn.shopify.com/s/files/1/0431/241

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000781b.bin
c96153a319f6ddf62c0b27b02896f0866bccd5098bf9e1f285ce51835f8491d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x781B 5280 bytes
font_01_sfnt_off00008a06.bin
e2b330a8ffc975d7f81ae221ec30d4499c15db8efc5c19cba9f97dd9e3844051		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A06 12096 bytes

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