Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd3c4d812a71465b…

MALICIOUS

PDF

41.0 KB Created: 2020-08-19 23:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3d3562001134604dfeaa2330193890d SHA-1: 1f3f16359f74d8eba95f72f76ba5999c5625d13c SHA-256: bd3c4d812a71465be58e4b6ca2c88c1b6c8a569c662281f9d7398ba89fabba37
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link directs to a known malicious redirector. This suggests the document is designed to lure users into clicking malicious links under the guise of providing an installation guide. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/pify?keyword=dado+trunking+installation+guide
    • http://files.lscreativedesign.com/uploads/1/3/1/6/131636941/fizet_lanufegawapa.pdf
    • http://files.twf-solutions.com/uploads/1/3/1/4/131453215/rubikone.pdf
    • http://files.amenfordesign.com/uploads/1/3/0/7/130775974/b949e643655c.pdf
    • http://nafenok.alqudspub.net/uploads/1/3/0/7/130776407/doxode_difikola_zogelufef.pdf
    • http://ragelepig.ugroup-trade.com/uploads/1/3/2/6/132681513/8679683.pdf
    • https://cdn.shopify.com/s/files/1/0434/7556/6752/files/geremeseguvu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2333/4567/files/zovidukago.pdf
    • https://cdn.shopify.com/s/files/1/0434/4646/8769/files/50595558744.pdf
    • https://cdn.shopify.com/s/files/1/0430/6318/1473/files/pdf_to_word_converter_online_2pdf.pdf
    • https://cdn.shopify.com/s/files/1/0436/0637/6611/files/convert_a_to_black_and_white.pdf
    • https://cdn.shopify.com/s/files/1/0431/5286/7477/files/gevogofunodowowalalovive.pdf
    • https://cdn.shopify.com/s/files/1/0438/0193/6033/files/article_on_child_labour_in_200_words.pdf
    • https://cdn.shopify.com/s/files/1/0439/0541/7371/files/calculating_area_of_irregular_shapes.pdf
    • https://cdn.shopify.com/s/files/1/0428/8151/5673/files/nikefijinajinosikazizuwo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7703/3372/files/toxap.pdf
    • https://cdn.shopify.com/s/files/1/0432/9373/7118/files/98737764282.pdf
    • https://cdn.shopify.com/s/files/1/0429/4089/1292/files/suspicious_minds_guitar_tab.pdf
    • https://cdn.shopify.com/s/files/1/0435/4677/1607/files/vutesusofig.pdf
    • https://cdn.shopify.com/s/files/1/0432/5274/4347/files/datuzajakulewarupule.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_off000059f5.bin
037ee7a6c0fa1584772753db3d129377b4af598c81d131f7bc9fb5dd0f3e3391		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59F5 5056 bytes
font_01_sfnt_off00006b36.bin
244b86b4925dd8af4fa79f9f4dcf141e48074c6c27fbc7ec5abef6f4087af69f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B36 14116 bytes

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