Malicious PDF — malware analysis report

Static analysis result for SHA-256 601a8e9273fbe193…

MALICIOUS

PDF

42.3 KB Created: 2020-08-09 09:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecd1710428f4b21b27dbbeebcf08d478 SHA-1: c964a6e9b63d40ad4929f38adf3c7140b05eb7e1 SHA-256: 601a8e9273fbe1937cf9001776678dc09759c04b1b6083e4774d9b7eecb20b5b
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to what appears to be a link farm designed for SEO manipulation. One critical heuristic firing indicates a direct link to known malicious redirector infrastructure, specifically `https://ttraff.cc/pify?keyword=basic+excel+test+questions+and+answers+pdf`. This suggests the document's primary purpose is to redirect users to malicious sites under the guise of providing useful content.

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=basic+excel+test+questions+and+answers+pdf
    • http://files.thesoloagency.com/uploads/1/3/0/8/130813796/vusaza-nopuzax.pdf
    • http://files.leecovet.com/uploads/1/3/1/3/131381055/vuliposero.pdf
    • http://files.shafonlinestore.org/uploads/1/3/1/4/131406365/e53099b918c4c.pdf
    • http://files.jaramilyn.com/uploads/1/3/1/4/131437005/jixorozuge-wukekijodulavuj-sifetojadug-vonesupakinalel.pdf
    • http://files.marinelifeproductions.com/uploads/1/3/1/1/131163859/2353714.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/91693122152.pdf
    • https://cdn.shopify.com/s/files/1/0432/5208/9000/files/zilaja.pdf
    • https://cdn.shopify.com/s/files/1/0435/1026/8064/files/21467747059.pdf
    • https://cdn.shopify.com/s/files/1/0429/2198/4166/files/jiwubud.pdf
    • https://cdn.shopify.com/s/files/1/0429/9541/7237/files/10951548186.pdf
    • https://cdn.shopify.com/s/files/1/0434/6055/9013/files/sovofoputobifu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8043/4342/files/wisikewukunu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6105/9482/files/62131562016.pdf
    • https://cdn.shopify.com/s/files/1/0430/6314/8706/files/11036720893.pdf
    • https://cdn.shopify.com/s/files/1/0438/4430/5061/files/baxexubiporugoja.pdf
    • https://cdn.shopify.com/s/files/1/0433/3692/5342/files/benoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zaxolaxowixinetubosi.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_off0000667e.bin
0308fd16fa9acb2b74a16ee0fec687eac531902d546c759460f949c6b134a3d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x667E 5484 bytes
font_01_sfnt_off00007947.bin
2fbb5548bd94515952f4f95f3dfefd3e0e1b71d7ee94eff23799e6768f95426b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7947 10156 bytes

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