Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cdc59f5a270ee14…

MALICIOUS

PDF

45.5 KB Created: 2020-08-13 00:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ecbfc5fc78a1016a699d7c3e63ef4c7 SHA-1: e508baaa597e2e3349d4ee2b124901f8480e277a SHA-256: 5cdc59f5a270ee1479e22c35ce9a7d5b79d0f62d9d65834b3cc3bd0cb959c1ee
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, indicating an attempt to lead the user to malicious content. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, contains text related to financial topics and the malicious URL, suggesting a lure for users interested in such subjects. No scripts were extracted, but the presence of malicious links is sufficient evidence for this assessment.

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/pify?keyword=time+value+of+money+problem+and+solution+pdf
    • http://gexopoz.heavenlyangelsart.org/uploads/1/3/0/8/130874359/630f85a1b2ada.pdf
    • http://files.hollysullivanmcclure.com/uploads/1/3/2/7/132712333/903185.pdf
    • http://files.dinah-parums.com/uploads/1/3/0/7/130740316/154a416f895.pdf
    • http://rixobi.nubeginningfarm.com/uploads/1/3/1/1/131164250/ruzuxidepawexu_pafefi_zulupevazanato_vesesij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/2358/0839/files/12556853611.pdf
    • https://cdn.shopify.com/s/files/1/0440/1928/6174/files/ic_cd40106.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5812/files/49625997382.pdf
    • https://cdn.shopify.com/s/files/1/0435/4516/5976/files/tajakuzu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4146/3189/files/tisezivi.pdf
    • https://cdn.shopify.com/s/files/1/0439/9503/7854/files/bank_exam_question_paper_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/11119483335.pdf
    • https://cdn.shopify.com/s/files/1/0434/5747/8809/files/lerigixeletajinizosus.pdf
    • https://cdn.shopify.com/s/files/1/0431/6885/8276/files/80321920456.pdf
    • https://cdn.shopify.com/s/files/1/0434/7287/9773/files/30964047644.pdf
    • https://cdn.shopify.com/s/files/1/0432/2289/2711/files/xopewonugiga.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000736b.bin
2e914c9c27d2282b241985c902482aba4795bd37dbe637d7f0e2025676bd3f64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x736B 5436 bytes
font_01_sfnt_off000085d3.bin
3890579db70aa45b0ebd47e2dadd50dfc16d474614670c732a4a6fc9ac6324e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85D3 10404 bytes

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