Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cacfd80de46e964…

MALICIOUS

PDF

44.0 KB Created: 2020-08-06 21:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08534a28e55d176b9fd39337d83a2c4b SHA-1: 9b393c648ece0f0c87f0aae74477d8b0a16b5df0 SHA-256: 8cacfd80de46e9646722f37b6b578f136ce3693e6834f27ac930acdfc47ccbcc
152 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and heuristics indicate it contains a large number of external links, many pointing to potentially malicious redirectors. The primary malicious URL identified is https://ttraff.ru/pify?keyword=black+s+law+dictionary+pdf. The document body contains garbled text but also includes the same malicious URL, suggesting a lure to download or view a document, which then redirects to a malicious site.

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=black+s+law+dictionary+pdf
    • http://files.babystepstosuccessfcc.com/uploads/1/3/1/4/131406600/wafuzegevedeb.pdf
    • http://files.matthewjgoodwin.org/uploads/1/3/1/4/131453902/7c3e1b27e.pdf
    • http://files.sacpb.org/uploads/1/3/1/4/131408103/6283219.pdf
    • http://files.pascaline-preorder.com/uploads/1/3/1/4/131437660/9855720.pdf
    • http://files.phimi.pt/uploads/1/3/1/4/131482954/4e834d.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94448736580.pdf
    • https://cdn.shopify.com/s/files/1/0431/8950/2111/files/duxozinabove.pdf
    • https://cdn.shopify.com/s/files/1/0433/7047/9768/files/76792870378.pdf
    • https://cdn.shopify.com/s/files/1/0435/3051/8679/files/12923390528.pdf
    • https://cdn.shopify.com/s/files/1/0429/3630/3782/files/kujatuwinufol.pdf
    • https://cdn.shopify.com/s/files/1/0435/4405/1864/files/pumikutuwum.pdf
    • https://cdn.shopify.com/s/files/1/0439/2806/0059/files/p90x_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/nosofamexaretew.pdf
    • https://cdn.shopify.com/s/files/1/0433/1870/6341/files/62361729926.pdf
    • https://cdn.shopify.com/s/files/1/0431/0879/4525/files/bp_lathi_signals_and_systems.pdf
    • https://cdn.shopify.com/s/files/1/0431/6623/6834/files/bupozemid.pdf
    • https://cdn.shopify.com/s/files/1/0434/3349/2641/files/jejasozukuwenupanuvogadij.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/
    • https://cdn.shopify.com/s/files/1/0431/0879/4525/files/bp_lathi_signals_and_syste

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000055ee.bin
4764e0ec012dfcc370b6e16f81eccef9a3e97b98711a92ffea03c92ab6b5ba23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55EE 5456 bytes
font_01_sfnt_off000068a5.bin
c07a25dd319b9f19a0075cf0693fc1c648f105f6e3218522dab929596f4612a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68A5 10504 bytes
font_02_sfnt_off00008ca4.bin
bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CA4 16312 bytes

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