Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f16782ca11d7dac…

MALICIOUS

PDF

45.7 KB Created: 2020-08-08 08:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2905905e14b3661bce6ed8b949820887 SHA-1: b71f6e99b57837a8098eda2a9e77ecb874cb0613 SHA-256: 2f16782ca11d7dac992d03d11d503fc1b5ae71f38e36536a41e61e6a5ec0b1c1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to a job description, suggesting a lure to entice clicks. 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.ru/pify?keyword=program+coordinator+job+description+non+profit+pdf
    • http://files.golffordreams.com/uploads/1/3/0/7/130739340/8cae2cb9.pdf
    • http://bavubo.climacusconference.org/uploads/1/3/1/4/131407995/detemevevavibovuzes.pdf
    • http://files.toxicteez.com/uploads/1/3/0/8/130874197/89f84e.pdf
    • http://files.landzmanagement.com/uploads/1/3/1/8/131856125/257443.pdf
    • https://cdn.shopify.com/s/files/1/0433/4141/4552/files/jinuwekebuganerina.pdf
    • https://cdn.shopify.com/s/files/1/0431/5699/6245/files/tosawubi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5764/2648/files/zadedizutexewapuxas.pdf
    • https://cdn.shopify.com/s/files/1/0435/8651/9203/files/mulevalijekedisitufusepu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3888/4519/files/upkar_reasoning_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/8062/9913/files/69002812055.pdf
    • https://cdn.shopify.com/s/files/1/0438/8870/5688/files/jidofinej.pdf
    • https://cdn.shopify.com/s/files/1/0431/2491/6388/files/52606851098.pdf
    • https://cdn.shopify.com/s/files/1/0433/4642/8059/files/tojotofo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3091/2934/files/51130404978.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8360/files/puvavitekaduzokexexi.pdf
    • https://cdn.shopify.com/s/files/1/0427/7973/8278/files/fitawozenaxejobirog.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xasojikunu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9405/6861/files/college_attendance_certificate.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006576.bin
871153ba151ad19ddbf40132ff9035dce1857fe8528a38a083ecf6e56e70882a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6576 5448 bytes
font_01_sfnt_off000077da.bin
84ec499255e6bf1ccceedca40ead4e181e9cc46de606b33cd895dddd6f530db6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77DA 10296 bytes
font_02_sfnt_off00009ae4.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AE4 4324 bytes

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