Malicious PDF — malware analysis report

Static analysis result for SHA-256 8682d106fa348f2a…

MALICIOUS

PDF

41.9 KB Created: 2020-08-18 13:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21ed8331002dd0723b56bce6a0117712 SHA-1: 33680cf2e30d7ca961a2128da8405fac51091eaf SHA-256: 8682d106fa348f2a1a1c41bb5de164f65aa513ed833947d0f3464a22a4885ecf
154 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that triggers the redirector. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm intended to manipulate search engine results or distribute further malicious content. 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=anti+aging+skin+care+reviews+consumer+reports
    • http://files.schonestandardschnauzer.com/uploads/1/3/1/0/131070688/gojisirek.pdf
    • http://files.adorablepotatocreations.com/uploads/1/3/0/7/130738771/593082.pdf
    • https://cdn.shopify.com/s/files/1/0436/2852/7776/files/ejercicios_de_caida_libre_4_eso.pdf
    • https://cdn.shopify.com/s/files/1/0427/8901/1612/files/ditejexozirodobazunim.pdf
    • https://cdn.shopify.com/s/files/1/0432/6922/6656/files/appsc_group_1_syllabus_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/9601/3990/files/93496249466.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/calendula_planta_medicinal.pdf
    • https://cdn.shopify.com/s/files/1/0435/8373/3921/files/affordable_care_act_summary.pdf
    • https://cdn.shopify.com/s/files/1/0432/7433/8454/files/9522711.pdf
    • https://cdn.shopify.com/s/files/1/0434/7379/7285/files/99416418634.pdf
    • https://cdn.shopify.com/s/files/1/0433/9413/8268/files/gamanufidi.pdf
    • https://cdn.shopify.com/s/files/1/0435/1187/3688/files/abby_transformer_3._0_pro.pdf
    • https://cdn.shopify.com/s/files/1/0435/7075/7795/files/gapawimolopaduperazutatid.pdf
    • https://cdn.shopify.com/s/files/1/0432/7289/6672/files/muwenurebowuxutupon.pdf
    • https://cdn.shopify.com/s/files/1/0437/9515/3058/files/myers_briggs_types_explained.pdf
    • https://cdn.shopify.com/s/files/1/0430/1425/8851/files/16895668612.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_off00006786.bin
8c7c6ff921692b371a68f535014d7bcea0d24a1d265a2e2f04d33f8c3718e580		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6786 5428 bytes
font_01_sfnt_off000079fb.bin
f52caa8d9382f83239f354eb37d6f30f2931c7a70ea2611098d8e9ea03d7fa7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79FB 9604 bytes

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