Malicious PDF — malware analysis report

Static analysis result for SHA-256 c427bdf619b11fc9…

MALICIOUS

PDF

50.7 KB Created: 2020-07-26 11:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3389bf6b089b0c586af0df6ab37516c9 SHA-1: b7a013b35aa48954a09009361c5d4a68b791de39 SHA-256: c427bdf619b11fc99b16f7a1c3128faed612ca9242d5759b6acffbb8bcfa083d
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on 'cdn.shopify.com'. The document body, though heavily obfuscated, contains text related to 'Bengali new song' and metadata indicating it was generated by wkhtmltopdf, suggesting a lure to entice clicks on the malicious redirector. No scripts were extracted, but the primary attack vector appears to be social engineering via malicious links.

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.com/pify?keyword=bengali+new+song
    • http://files.karaikudivoyage.us/uploads/1/3/1/3/131381374/8942354.pdf
    • http://files.global4xloan.com/uploads/1/3/1/3/131379971/muzefatekulorig_puvolikozates_gefagarazosex_zulawovetij.pdf
    • http://files.dakotatrackfield.com/uploads/1/3/1/6/131637723/af85e6ae23a.pdf
    • http://files.ebast.net/uploads/1/3/1/4/131410094/gifugukejafu.pdf
    • http://files.karaikudivoyage.us/uploa
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/25322908130.pdf
    • https://cdn.shopify.com/s/files/1/0432/0736/0667/files/98397940804.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7405/files/mifirunepoluto.pdf
    • https://cdn.shopify.com/s/files/1/0432/1378/3203/files/ganugujunojiwixesumuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/35679391278.pdf
    • https://cdn.shopify.com/s/files/1/0431/9769/4109/files/56514495806.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65788935473.pdf
    • https://cdn.shopify.com/s/files/1/0433/1339/7924/files/wakegadalitenat.pdf
    • https://cdn.shopify.com/s/files/1/0437/3970/9589/files/wavudefo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6006/0567/files/xivemokazinu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/wigerusalikarifori.pdf
    • https://cdn.shopify.com/s/files/1/0437/5206/3125/files/dezuditavon.pdf
    • https://cdn.shopify.com/s/files/1/0428/5880/7455/files/41299344685.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_off00008117.bin
fb2f601bbce81470988c2e3f5848e8ea0039997928178023c5ba86eb426a959f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8117 4608 bytes
font_01_sfnt_off000090d4.bin
a5e2701857bf405f47e9b7ac16c157e6c7034afe2863fe1bf6cdc07a767a12a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90D4 14524 bytes

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