Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef0f0794cdab837…

MALICIOUS

PDF

52.5 KB Created: 2020-08-11 22:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 319cd558dc15614a189ec8d7c59eb95a SHA-1: b128ffa6b30b029f283c8df22c1b636eb9dcd326 SHA-256: 0ef0f0794cdab8377e4bc021b7fd791d1236be99e4250ef7256cfad2daf9dda3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to benign Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL and appears to be a lure for 'learning needs analysis and evaluation'. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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=learning+needs+analysis+and+evaluation+pdf
    • http://files.parkcitybrewery.com/uploads/1/3/2/6/132695258/rudilawebizokukor.pdf
    • http://files.lizannbassham.com/uploads/1/3/1/3/131383541/9516665.pdf
    • http://files.americaimproving.com/uploads/1/3/2/6/132682110/528907.pdf
    • http://files.nefertitibeautysalon.com/uploads/1/3/2/3/132302888/8030411.pdf
    • http://files.intentionalmba.com/uploads/1/3/0/7/130775998/3663881.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/3789128943.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6654/files/34979871226.pdf
    • https://cdn.shopify.com/s/files/1/0431/3468/1250/files/89544461894.pdf
    • https://cdn.shopify.com/s/files/1/0430/7199/6053/files/22374138971.pdf
    • https://cdn.shopify.com/s/files/1/0439/2199/7979/files/navodaya_online_form.pdf
    • https://cdn.shopify.com/s/files/1/0428/8207/2739/files/musatuzabufox.pdf
    • https://cdn.shopify.com/s/files/1/0430/9437/6605/files/arithmetic_mean_median_mode.pdf
    • https://cdn.shopify.com/s/files/1/0432/5448/1054/files/17632500287.pdf
    • https://cdn.shopify.com/s/files/1/0430/8487/3879/files/77541263896.pdf
    • https://cdn.shopify.com/s/files/1/0431/3461/5719/files/navumowep.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78214852322.pdf
    • https://cdn.shopify.com/s/files/1/0428/4124/3814/files/pizejodemapugazamasaderun.pdf
    • https://cdn.shopify.com/s/files/1/0436/4291/2926/files/8305650982.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000080b7.bin
ddf0fc4e1a83d6a1684e7b0e276aaf4780e083f7e3dffac60f2f09f09195ed83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80B7 5192 bytes
font_01_sfnt_off0000927a.bin
0886f3ba586c25ad14ea26854ec6fa6bf924f1cad0aa8143f2a7cd2246e7fb08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x927A 10632 bytes
font_02_sfnt_off0000b694.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB694 4324 bytes

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