Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa7c6b9acdf819fc…

MALICIOUS

PDF

39.7 KB Created: 2020-08-18 21:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15fce51f4ad066ad534eac96e21998f6 SHA-1: 94676c14e0558dc0ec6d5d28767c338e7a4e1528 SHA-256: fa7c6b9acdf819fc504864d55db3f6976d2650f0c758382211368f7e0840ae1e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a malicious redirector link, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text suggesting a lure related to a 'gds pay committee report today'. The PDF_SEO_LINK_FARM heuristic indicates a mass of external PDF links, with the primary one pointing to a redirector. The ML_NYX_PDF_MALICIOUS classifier also strongly flagged this PDF.

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=gds+pay+committee+report+today
    • http://files.mare20.com/uploads/1/3/0/9/130969700/f108a9184790.pdf
    • https://cdn.shopify.com/s/files/1/0430/8012/2532/files/wejeduso.pdf
    • https://cdn.shopify.com/s/files/1/0434/2677/5196/files/12441868669.pdf
    • https://cdn.shopify.com/s/files/1/0431/1983/7346/files/41572335226.pdf
    • https://cdn.shopify.com/s/files/1/0433/9249/9877/files/77445385291.pdf
    • https://cdn.shopify.com/s/files/1/0449/3590/5448/files/maplestory_cygnus_knights_skill_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/2482/6014/files/bolopaletopemas.pdf
    • https://cdn.shopify.com/s/files/1/0437/7296/9109/files/nigif.pdf
    • https://cdn.shopify.com/s/files/1/0428/3439/5295/files/betijefuzom.pdf
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/12192676928.pdf
    • https://cdn.shopify.com/s/files/1/0431/5286/7477/files/zisixi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8413/6086/files/2017469578.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005dc9.bin
c92e7a310bd9145526170c43b8501bd371eafaa5b7f465124dc8d9dfaf1a0064		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DC9 5320 bytes
font_01_sfnt_off00006fd7.bin
9a94db1787deff447a838163e2dd1b29047ed767c1d9c2f2bb3eb00218595576		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD7 10028 bytes

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