Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc78325ae280626…

MALICIOUS

PDF

48.5 KB Created: 2020-08-12 03:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a07a83239bf6728a8c29e048ef2b1791 SHA-1: d385f6cdf409d7dac1688d731db59c7be5de7496 SHA-256: 6dc78325ae280626d3da6091bdc441492cbaa17bc614af48a3b7aa6f1009b800
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure for a free PDF, and the presence of many links indicates a link farm or redirection scheme. The ML classifier also strongly flagged this PDF as malicious.

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=amulet+book+8+free+pdf
    • http://files.emilymcsherry.com/uploads/1/3/0/7/130739043/4039303.pdf
    • http://neriw.bagusnugroho.com/uploads/1/3/2/8/132814930/jakujeni_tukedanijawap_vojedomanilul_lekix.pdf
    • http://komegu.edwardmoak.com/uploads/1/3/2/8/132814930/jedezozu.pdf
    • http://xagoge.solihullurc.org.uk/uploads/1/3/1/3/131383314/votibolemovata.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8611/9079/files/7091356724.pdf
    • https://cdn.shopify.com/s/files/1/0431/9979/1265/files/wuwitubonomelufot.pdf
    • https://cdn.shopify.com/s/files/1/0427/9068/2783/files/lexiketumos.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/japoxotoruzub.pdf
    • https://cdn.shopify.com/s/files/1/0429/2699/7663/files/wixumiduriwosogedabefegor.pdf
    • https://cdn.shopify.com/s/files/1/0431/3179/7668/files/nikorijulamijesaruzapu.pdf
    • https://cdn.shopify.com/s/files/1/0429/4764/1510/files/ispad_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/6078/8390/files/the_data_warehouse_etl_toolkit_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/7019/2805/files/sogixasidufolebadubul.pdf
    • https://cdn.shopify.com/s/files/1/0438/1717/3152/files/fesuzibesuvenomola.pdf
    • https://cdn.shopify.com/s/files/1/0438/3762/0386/files/viweluroxemubobelinax.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e98.bin
45f06132be23c0b4d8b84c726d54d8095a523cb482c9b995c91452900aae23a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E98 5184 bytes
font_01_sfnt_off0000701f.bin
297f52f4236f09ba58e85c0251406db64a4d3221d73012e717b108c12409d6fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x701F 2576 bytes
font_02_sfnt_off000079de.bin
db062efa86939c1a0d8a585205b66622ce29b8e52917b5db929b3e9722df7a73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79DE 10216 bytes
font_03_sfnt_off00009cda.bin
68360d215686b7ffd363eeb0253592cf4566abf286d77cfdfbfe23f63f7602e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CDA 16780 bytes

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