Malicious PDF — malware analysis report

Static analysis result for SHA-256 1717386e3b2ba9ef…

MALICIOUS

PDF

52.1 KB Created: 2020-07-31 18:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6adcd85f87b439439305b2f4157af43d SHA-1: 6c49c2f82bc3955867063d8e7f08e8afe786830b SHA-256: 1717386e3b2ba9efe34870ac570f0068c438783039eaf8e4afadbf483a672686
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous links suggests an attempt to lure the user to external, potentially harmful, sites.

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=example+css+file
    • http://files.literacyshedblog.com/uploads/1/3/2/7/132740949/zobawonovozin.pdf
    • http://files.anestesia-triveneto.org/uploads/1/3/1/6/131607374/4722937.pdf
    • http://files.kugelcraft.com/uploads/1/3/0/7/130776499/suripipexawu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tosinumemelijigejidab.pdf
    • https://cdn.shopify.com/s/files/1/0433/8827/2807/files/nalapazonivesizitufo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6463/1189/files/xusibegisanawana.pdf
    • https://cdn.shopify.com/s/files/1/0431/4637/9426/files/90237784672.pdf
    • https://cdn.shopify.com/s/files/1/0437/8597/8013/files/mobupaweb.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6278/files/87450939330.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mipin.pdf
    • https://cdn.shopify.com/s/files/1/0437/4993/3208/files/50770877679.pdf
    • https://cdn.shopify.com/s/files/1/0428/1804/4063/files/zuzupufisutijewubufuk.pdf
    • https://cdn.shopify.com/s/files/1/0429/9869/4049/files/60338888593.pdf
    • https://cdn.shopify.com/s/files/1/0438/7949/7896/files/beberotigi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5115/5618/files/mejexarad.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_off0000851d.bin
460627d5cb249937bcbb3bcae4ff78c0f6c4a894041e9fefa37561fc9ec98a34
pdf-font-stream PDF embedded font (sfnt) at offset 0x851D 5092 bytes
font_01_sfnt_off00009668.bin
486ee7435526eae0fdaaae08dd7bbc1d91089b34af058f05edf754e4054809ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x9668 14316 bytes