Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a06106a62859f24…

MALICIOUS

PDF

41.5 KB Created: 2020-07-31 23:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e485a319e2b6cdb02fe3e73674fc3c30 SHA-1: caa0ea1325a39420317cd1ee2e4d5627eba90a60 SHA-256: 0a06106a62859f2438764314e9e28060c0e040faa0b3c988ab9c4ab6811791be
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service designed to obscure the final destination. The primary malicious URL identified is https://ttraff.cc/pify?keyword=manhattan+gmat+sentence+correction+6th+edition+pdf, which likely leads to a phishing or malware distribution site. The document body, though heavily obfuscated, contains references to study materials, suggesting a lure to trick users into clicking the malicious links.

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=manhattan+gmat+sentence+correction+6th+edition+pdf
    • http://files.nashvilleperformancepsych.net/uploads/1/3/1/0/131070317/xejod-nudigoxemer.pdf
    • http://files.grayducks.org/uploads/1/3/2/6/132696274/fasamodanegefuk_jakutuvan_tijokowagetop_fumob.pdf
    • http://files.bristol.co.nz/uploads/1/3/1/6/131637546/xezafolipuk.pdf
    • http://files.kristenlucasphoto.com/uploads/1/3/1/4/131453151/bafifujezubumujala.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/8846/9398/files/17514463763.pdf
    • https://cdn.shopify.com/s/files/1/0437/5946/8701/files/nasotolu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6615/4394/files/tukifiwosemotaturoribir.pdf
    • https://cdn.shopify.com/s/files/1/0436/1479/7981/files/13750524036.pdf
    • https://cdn.shopify.com/s/files/1/0437/5396/3678/files/24426162053.pdf
    • https://cdn.shopify.com/s/files/1/0429/6949/7753/files/puxikuvoxef.pdf
    • https://cdn.shopify.com/s/files/1/0440/8901/6472/files/dabiparesavozi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6127/1959/files/99155520231.pdf
    • https://cdn.shopify.com/s/files/1/0435/1331/5480/files/luwedaba.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/60561448525.pdf
    • https://cdn.shopify.com/s/files/1/0432/6224/7067/files/16735296972.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9874/files/tilogoxoranodosiwupuniru.pdf
    • https://cdn.shopify.com/s/files/1/0431/0089/7434/files/molikoxonovofam.pdf
    • https://cdn.shopify.com/s/files/1/0428/9078/9020/files/71363736181.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_off0000537b.bin
a1aa83bad19c3da090308c28c948d566bcada713cc74b234ae8d67f88c0d8890		 pdf-font-stream PDF embedded font (sfnt) at offset 0x537B 5696 bytes
font_01_sfnt_off000066bf.bin
79cb7e4e309b14998fc9282cc2c2c8c7276d96a43f89fde2935ef57a370ef57b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66BF 15496 bytes

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