Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba6ddf0d6d59577f…

MALICIOUS

PDF

47.6 KB Created: 2020-07-28 13:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d924ab2d57fb572d88941dc7e88cbe89 SHA-1: 6174e467e035ea718a675260c1f0ade37985be1b SHA-256: ba6ddf0d6d59577fb539ad060ecae29335996420fd624fc50e75cec7a5e83148
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with at least one pointing to a known malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM strongly indicate a malicious intent to redirect users to harmful sites. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, but the document body and heuristics suggest a link-based attack.

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=blue+tesla+xtc+pill+report
    • http://files.logosart.com.hk/uploads/1/3/1/6/131606533/bonokidufezobijariji.pdf
    • http://files.tennisunderthestars.net/uploads/1/3/1/4/131406535/22340256.pdf
    • http://files.gtrtl.org/uploads/1/3/2/6/132681144/vagafilofubewej.pdf
    • http://files.academy4.net/uploads/1/3/1/4/131453132/vopefigovinutilej.pdf
    • http://files.apostolicdeliverancefive.org/uploads/1/3/2/6/132681976/felidul.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vunususojorimit.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2691/files/mowilo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8777/4374/files/73785765019.pdf
    • https://cdn.shopify.com/s/files/1/0431/8652/0224/files/vamanokotifogijo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0756/files/jijujix.pdf
    • https://cdn.shopify.com/s/files/1/0427/6148/6503/files/33925079726.pdf
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/wubaxexojabidifirupuvu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9416/3102/files/60816805752.pdf
    • https://cdn.shopify.com/s/files/1/0433/6232/0536/files/11030237844.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_off00007cd5.bin
4ea3759dcc52000e94ef9178abb35a2a25f5cecf900c98d952387d696345a32a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CD5 4820 bytes
font_01_sfnt_off00008d4d.bin
0d0b8caaf78e24e4c6c2a104f07f2bb70f78f237e701093c9836ae141c92c967
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D4D 10552 bytes