Malicious PDF — malware analysis report

Static analysis result for SHA-256 4acbc7e2de1e81f2…

MALICIOUS

PDF

71.2 KB Created: 2020-08-21 01:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd85d23a928f3fd8976e725a2898c47b SHA-1: 3414ba7bf630e878baa54f42174d3d31a9dd4c1d SHA-256: 4acbc7e2de1e81f2819d0595989050e35c693c768515e39c22587bd71bc29e70
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 external PDF files hosted on Shopify. One prominent link, 'https://ttraff.cc/pify?keyword=make+money+answering+surveys+online', is identified as a malicious redirector. The document body, though partially corrupted, also contains this lure and references to making money online. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lure users to malicious sites.

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.cc/pify?keyword=make+money+answering+surveys+online
    • http://files.mandala-ou.com/uploads/1/3/2/6/132682754/mesiguxegoroki.pdf
    • http://jimenifib.andilockemears.com/uploads/1/3/2/8/132814930/lilezosos.pdf
    • http://jamezu.daughtersofthenewmoon.com/uploads/1/3/1/3/131398017/mimozoxefeza.pdf
    • http://files.aquinascareers.com/uploads/1/3/1/0/131069824/40a8bb.pdf
    • http://files.gracechurchponcacity.org/uploads/1/3/0/7/130740033/wemugugulew.pdf
    • https://cdn.shopify.com/s/files/1/0435/3890/7288/files/kusenuw.pdf
    • https://cdn.shopify.com/s/files/1/0428/0628/0355/files/44184051316.pdf
    • https://cdn.shopify.com/s/files/1/0436/7430/4662/files/mecanica_automobilistica.pdf
    • https://cdn.shopify.com/s/files/1/0429/9699/0105/files/radowanizinade.pdf
    • https://cdn.shopify.com/s/files/1/0436/1424/0931/files/factores_bioticos_y_abioticos_de_un_ecosistema_acuatico.pdf
    • https://cdn.shopify.com/s/files/1/0431/0541/9418/files/arduino_learning_sinhala.pdf
    • https://cdn.shopify.com/s/files/1/0432/4130/8320/files/reliability_and_validity_in_qualitative_research_kirk_and_miller.pdf
    • https://cdn.shopify.com/s/files/1/0434/6406/5188/files/sidesuvurepakig.pdf
    • https://cdn.shopify.com/s/files/1/0435/3762/9348/files/brazil_original_song_pagalworld.pdf
    • https://cdn.shopify.com/s/files/1/0437/9590/6721/files/kumugo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3340/3285/files/business_plan_cafeteria.pdf
    • https://cdn.shopify.com/s/files/1/0431/3595/9191/files/24815785465.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_off0000c297.bin
5c7e85014a5bbbce3dd216b98f24af67cb5bf41dba36f1cfd56d274a34bae692		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC297 5132 bytes
font_01_sfnt_off0000d407.bin
db5b0ef6a896f14a5eb0c605366c9c4844f6c969c7e68aca2d14a5d7cb7cb2bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD407 1792 bytes
font_02_sfnt_off0000dce1.bin
145ee952ded686f5e035604e5ff7e4483a147eb8b9713bde4c99e24f76185ff5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE1 10580 bytes
font_03_sfnt_off00010109.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10109 4324 bytes

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