Malicious PDF — malware analysis report

Static analysis result for SHA-256 746a05ae98e62ef7…

MALICIOUS

PDF

40.8 KB Created: 2020-08-07 22:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1bf65d1b56280e0482fd9b5a90cd50f SHA-1: 727651e7ef57aec1c46338a98cbdcd61bd9f8c45 SHA-256: 746a05ae98e62ef7fd012fd0cf44c2015c7e497822ea55d50a9c2ea6cdc5d67e
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and contains numerous links. One prominent link redirects through 'ttraff.cc', a known malicious redirector, to a URL containing 'exercicios resolvidos sobre capacitores pdf'. The document body is heavily obfuscated but appears to contain similar text and the redirector URL. The presence of a link farm and a malicious redirector suggests an attempt to drive traffic to potentially malicious sites, likely for phishing or malware distribution.

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=exercicios+resolvidos+sobre+capacitores+pdf
    • http://files.systercute.com/uploads/1/3/1/6/131637362/f3d69194d6.pdf
    • http://files.playcreativemarketing.com/uploads/1/3/2/6/132681488/3041660.pdf
    • http://files.goodbyechristianwhore.com/uploads/1/3/1/3/131380889/netapuv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3876/0342/files/56079178181.pdf
    • https://cdn.shopify.com/s/files/1/0431/2770/1655/files/11442645367.pdf
    • https://cdn.shopify.com/s/files/1/0428/2525/3023/files/xomesimiwivosekapareb.pdf
    • https://cdn.shopify.com/s/files/1/0430/5544/8213/files/sadesimowamubub.pdf
    • https://cdn.shopify.com/s/files/1/0432/9160/7190/files/49522107406.pdf
    • https://cdn.shopify.com/s/files/1/0429/2011/6387/files/xuxodilorozudegosarudopog.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/lizakuveketugeniridem.pdf
    • https://cdn.shopify.com/s/files/1/0434/6940/6360/files/julius_caesar_modern_english_translation.pdf
    • https://cdn.shopify.com/s/files/1/0431/0391/2098/files/konajosejavixokug.pdf
    • https://cdn.shopify.com/s/files/1/0432/2738/1924/files/quimica_general_e_inorganica_libros.pdf
    • https://cdn.shopify.com/s/files/1/0435/2576/7320/files/silent_letter_words_in_english.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_off0000612e.bin
49adc0e513a2ad0771b7ff6f41e94e3ab7bf09fb6d163ca6c8b4488fb8086583		 pdf-font-stream PDF embedded font (sfnt) at offset 0x612E 5372 bytes
font_01_sfnt_off0000738b.bin
4887b9961eb600b9b29b2e8efaeaa14ba4e249dca6ef62077aa2e9ac5a59f83a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x738B 10240 bytes

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