Malicious PDF — malware analysis report

Static analysis result for SHA-256 825402d93f0d0ea8…

MALICIOUS

PDF

51.3 KB Created: 2020-08-22 01:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ded800cdfc20c7a1c01df0c26b565981 SHA-1: c838307e0828e83099dff76de7db44e4d3b82fde SHA-256: 825402d93f0d0ea812e2e0c7577a1eed9f6df1dd5c70ca29d01c910b5fb16c44
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One of these links, https://ttraff.com/pify?keyword=younger+brother+in+korean+formal, is identified as a malicious redirector. The document body text is largely obfuscated but contains the same malicious URL, suggesting the primary intent is to redirect the user to malicious infrastructure. No scripts were extracted from this sample.

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=younger+brother+in+korean+formal
    • http://files.madtownrent.com/uploads/1/3/2/8/132815365/mafinadoxuvire.pdf
    • http://files.lookingbacklineage.com/uploads/1/3/1/4/131453401/2d2aa.pdf
    • http://kekanovam.talkinghardwood.com/uploads/1/3/1/0/131070389/tuvusokeganari.pdf
    • http://files.harponwight.co.uk/uploads/1/3/0/7/130739971/mudetolodoxelu-supajiku.pdf
    • http://gajologeb.redhawkcommunity.com/uploads/1/3/1/8/131860479/ropupina.pdf
    • https://cdn.shopify.com/s/files/1/0435/2226/1143/files/portal_2_voice_lines.pdf
    • https://cdn.shopify.com/s/files/1/0429/3391/1705/files/93275336471.pdf
    • https://cdn.shopify.com/s/files/1/0464/7452/6870/files/user_registration_form_css_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/6731/8167/files/feasibility_study_on_broiler_production_in_the_philippines.pdf
    • https://cdn.shopify.com/s/files/1/0435/7593/5134/files/food_handlers_certificate_final_exam_answers.pdf
    • https://cdn.shopify.com/s/files/1/0454/2601/6424/files/tanivaxa.pdf
    • https://cdn.shopify.com/s/files/1/0428/5697/2455/files/melowonirof.pdf
    • https://cdn.shopify.com/s/files/1/0437/2506/2298/files/39344276681.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/81825757078.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005da4.bin
0ecbc303cb0f1d3e4eb99f6bdfb74551fd891fc19d706d625189eb226198b6ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DA4 7340 bytes
font_01_sfnt_off0000760a.bin
098cd4d5fc2aefe8fb2eaf7b2b50ecf8d785ec17e5678efef031ae141dba674d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x760A 5168 bytes
font_02_sfnt_off0000877a.bin
9c067f2301ea726fc23f8f772806c55210ea57ecd160c57c2d234506583f983d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x877A 10064 bytes
font_03_sfnt_off0000aa30.bin
ee51351c9eb8c6a9dbff1bb743467f39bbaa64eee970481c040e8f02c1ffc4b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA30 16340 bytes

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