Malicious PDF — malware analysis report

Static analysis result for SHA-256 039ea73071d2e0e8…

MALICIOUS

PDF

39.4 KB Created: 2020-08-15 10:37:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5928f488bce33d64dab448876493507 SHA-1: c4d43a2aa5a582359121d4a7b254a929a3b6efba SHA-256: 039ea73071d2e0e81e8af5569c8ed08de2f514e07d484d73c783beb2c09a4358
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 known for malicious activity. The document body, though obfuscated, contains a URL that is also present in the link farm, suggesting an attempt to drive traffic to malicious sites. The ML classifier strongly indicated maliciousness, supporting the presence of a link farm and redirector.

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=pizza+dough+sheeter+used
    • http://files.biblegematria.com/uploads/1/3/2/6/132682282/wejavevupa.pdf
    • http://raninimo.sacredmusicfestival.org.uk/uploads/1/3/0/8/130814124/6210126.pdf
    • http://files.geersrobotics.com/uploads/1/3/0/9/130968993/safavozepowesu_piratapo.pdf
    • http://files.katiemichellefriedman.com/uploads/1/3/1/0/131070597/3594083.pdf
    • http://zorerofo.anotsoemptynest.com/uploads/1/3/1/6/131637136/7f74deae7c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3839/9902/files/nom_aditivos_alimentarios.pdf
    • https://cdn.shopify.com/s/files/1/0431/0702/5060/files/bopafarexulofete.pdf
    • https://cdn.shopify.com/s/files/1/0432/1270/1860/files/36235270785.pdf
    • https://cdn.shopify.com/s/files/1/0435/7252/7267/files/list_of_excel_formulas_and_functions.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zinigezumapafukutogu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/vomaxaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/6091/9446/files/pelubuxowujusag.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3077/files/51041335276.pdf
    • https://cdn.shopify.com/s/files/1/0428/6572/1503/files/3247150862.pdf
    • https://cdn.shopify.com/s/files/1/0432/8262/8766/files/66225369515.pdf
    • https://cdn.shopify.com/s/files/1/0431/7518/2485/files/xusumosudarizumiwe.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/zaxexiwolapesuvage.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_off00005d8f.bin
484a628528f4a9d46edb0488676b7f39ac7a21d23038f1182182efe4fb6bef1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D8F 5104 bytes
font_01_sfnt_off00006ee4.bin
2038ef002b024f2d0666aa856914f027fbe764b4205d6c94228784a966a4f83b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE4 10056 bytes

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