Malicious PDF — malware analysis report

Static analysis result for SHA-256 10d130b42045f4b3…

MALICIOUS

PDF

37.8 KB Created: 2020-08-11 01:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a62dd2d36bd827ee8182710d4e9c63cc SHA-1: aa694ffc8469fc98d0ea4a9cd65d3647fb6cbb12 SHA-256: 10d130b42045f4b38f0112d6662badb8a3887ebb3d8b8b2633741d63a7ec4baf
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to drive traffic to malicious sites. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely to trick users into visiting harmful 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.cc/pify?keyword=active+passive+voice+pdf+worksheet
    • http://savika.trixielizard.com/uploads/1/3/0/8/130814168/nesijimomexij_dujosabaro_kuremajoka_juwawatepo.pdf
    • http://files.codeblaque.com/uploads/1/3/2/6/132695741/febikupa-safiboxe-fivami-jikitudup.pdf
    • http://files.wildlife-specialists.com/uploads/1/3/0/9/130969944/porotaboram.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3871/9648/files/danotifi.pdf
    • https://cdn.shopify.com/s/files/1/0434/8936/2082/files/vidudubafekuzezol.pdf
    • https://cdn.shopify.com/s/files/1/0434/5249/8070/files/congenital_gastrointestinal_disorders.pdf
    • https://cdn.shopify.com/s/files/1/0450/7769/2581/files/english_to_bangla_vocabulary_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/4279/1839/files/adamantite_scrap_sekiro.pdf
    • https://cdn.shopify.com/s/files/1/0431/9395/8560/files/cardiopatia_isquemica_clasificacion.pdf
    • https://cdn.shopify.com/s/files/1/0427/9028/9574/files/30593332775.pdf
    • https://cdn.shopify.com/s/files/1/0430/8313/7178/files/biology_in_focus_campbell_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/6226/2936/files/20960897665.pdf
    • https://cdn.shopify.com/s/files/1/0433/0360/0283/files/loxasujewemujo.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_off0000563b.bin
63033bf7da815cf07da02e5186014a28c1ed6106bb2b4f98133ea46d7adec1b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x563B 5416 bytes
font_01_sfnt_off000068ae.bin
cdddb1f42c2f13a45e1e5ad233a7c9d61043cf3ffce9715c902666e0865d1bc5
pdf-font-stream PDF embedded font (sfnt) at offset 0x68AE 9852 bytes