Malicious PDF — malware analysis report

Static analysis result for SHA-256 13bf118fb0a63646…

MALICIOUS

PDF

52.4 KB Created: 2020-08-03 17:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56fa8713bddbf6527c63d0fc48e3e42b SHA-1: 71bebe8938fea973e39ef9fbea02c4363e949756 SHA-256: 13bf118fb0a636462a45918888448531ab3d870cc29ce32bfc95025d5be26185
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a redirector to a malicious URL, disguised as academic content. The ML classifier strongly indicated maliciousness, and the presence of numerous external links suggests an attempt to drive traffic to potentially harmful sites. The primary malicious IOC is the redirector URL.

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=kant+and+the+problem+of+metaphysics+heidegger+pdf
    • http://files.hazardhealth.com/uploads/1/3/1/4/131437750/9008e.pdf
    • http://files.intelligentwoundcare.com/uploads/1/3/1/3/131379085/vedivi_pegugikavu.pdf
    • http://files.bdmchallenge.com/uploads/1/3/2/6/132681946/motezekujot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6579/4965/files/doxuvebubexuniwotipavi.pdf
    • https://cdn.shopify.com/s/files/1/0433/1329/9620/files/84108031378.pdf
    • https://cdn.shopify.com/s/files/1/0432/2020/5726/files/12920779146.pdf
    • https://cdn.shopify.com/s/files/1/0432/4327/4395/files/jupamudoligasate.pdf
    • https://cdn.shopify.com/s/files/1/0433/1054/7099/files/xexabowuraxi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6255/8874/files/22842400165.pdf
    • https://cdn.shopify.com/s/files/1/0431/6450/0134/files/rakelopetazizojumafiruk.pdf
    • https://cdn.shopify.com/s/files/1/0435/4169/2567/files/20853040346.pdf
    • https://cdn.shopify.com/s/files/1/0443/5614/1212/files/muscle_relaxant_gungeon.pdf
    • https://cdn.shopify.com/s/files/1/0432/6513/0658/files/32213614487.pdf
    • https://cdn.shopify.com/s/files/1/0434/0314/9462/files/59380834643.pdf
    • https://cdn.shopify.com/s/files/1/0428/9229/6359/files/tadanogudobuzikezizewo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6676/9058/files/kamozapapako.pdf
    • https://cdn.shopify.com/s/files/1/0434/5711/8374/files/wimalixetitedoduzexeto.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_off00008cff.bin
a9c56095e60808db59cc91ee1abac9b73f92d32665647bcf63a41bb7de774aea
pdf-font-stream PDF embedded font (sfnt) at offset 0x8CFF 5780 bytes
font_01_sfnt_off0000a091.bin
050c72a4710e62efefed699b8480cf8f0251c9d4ff0db7bf98e56fe8eecd085e
pdf-font-stream PDF embedded font (sfnt) at offset 0xA091 10568 bytes