Malicious PDF — malware analysis report

Static analysis result for SHA-256 27733cc45dcd1031…

MALICIOUS

PDF

41.0 KB Created: 2020-10-30 19:34:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2db6fff99a25361662f541617c67582c SHA-1: 72e619da6881c21815a2009c01e427335d5d500d SHA-256: 27733cc45dcd10314e54952b90590dd0db8d389f9d84587eb22e3ed4cc4957c2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.club/123?keyword=compostela+cebu+postal+code. Additionally, it exhibits characteristics of a PDF link farm, containing numerous external links, one of which is https://cdn.shopify.com/s/files/1/0268/7624/8250/files/tefatutubidepotateb.pdf. The document body, though heavily obfuscated, also contains the malicious redirector URL, suggesting an attempt to lure users to malicious content.

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.club/123?keyword=compostela+cebu+postal+code
    • https://gawubodukajine.weebly.com/uploads/1/3/0/9/130969599/f30e722feec7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0268/7624/8250/files/tefatutubidepotateb.pdf
    • https://uploads.strikinglycdn.com/files/7c5f8e9e-6e50-4f8e-ac1b-3530bf9918ac/xaletilufim.pdf
    • https://s3.amazonaws.com/sugowubuf/the_dip_seth_godin.pdf
    • https://uploads.strikinglycdn.com/files/9dbe9e44-e499-498a-a277-0f9933bf6083/moon_lovers_scarlet_heart_ryeo_ep_14_eng_sub_dramacool.pdf
    • https://cdn.shopify.com/s/files/1/0501/8130/8568/files/dance_audition_resume_template.pdf
    • https://uploads.strikinglycdn.com/files/136f8914-f2c7-4586-b3cf-e93c895a3cb9/54658922993.pdf
    • https://uploads.strikinglycdn.com/files/3bcb7c4c-73de-4c72-9365-ea9a240175b9/ravimane.pdf
    • https://uploads.strikinglycdn.com/files/c28856c4-5485-456f-83aa-2d797e2927f4/rukadopanitujovasezawujuv.pdf
    • https://uploads.strikinglycdn.com/files/3d88a70a-ecba-44d7-b1ee-34f97129c047/34112855113.pdf
    • https://s3.amazonaws.com/rijaliwiguvex/tiziruwibuzuvawijelisufin.pdf
    • https://uploads.strikinglycdn.com/files/31f27b83-58e9-4b39-80b3-0175dbffeefc/nixetuzavo.pdf
    • https://cdn.shopify.com/s/files/1/0268/7880/4154/files/tezugabokajamotam.pdf
    • https://uploads.strikinglycdn.com/files/9918be4d-64c2-42ad-ba0d-9209ef602f28/yamaha_350_warrior_service_manual.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062a6.bin
09554e9f5610e77813bcfda9072af405b70486b15defcc185a1439d70f6f8d95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62A6 5168 bytes
font_01_sfnt_off00007419.bin
f202756ae3ec20e810c50be4859956821b8513bf3978d185b77ab24c4176c06f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7419 10344 bytes

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