Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5ba782079b1ac26…

MALICIOUS

PDF

46.7 KB Created: 2020-08-20 18:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2699daadf1e037de8753f19c2030e26f SHA-1: 6efc4a12c2272022a66f6d31fda6e43ba583fd02 SHA-256: e5ba782079b1ac26c8184612ba85a8c65317948c947210453572887f7cb24962
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to benign Shopify domains, but one critical link directs to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to IELTS and includes the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to 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.ru/pify?keyword=ielts+reading+test+sample+answer+sheet
    • http://files.photolenka.com/uploads/1/3/1/6/131606984/e634b4cd.pdf
    • http://pixozira.sarahjeanhorwitz.com/uploads/1/3/2/8/132814930/1183c2346b9e17.pdf
    • http://jekukuron.chelseamwest.com/uploads/1/3/1/4/131483147/gibenanulo.pdf
    • http://files.feministforums.com/uploads/1/3/1/0/131070912/b9ac9b8e74b3b5b.pdf
    • http://files.bacchusinsurancegroup.com/uploads/1/3/0/7/130775969/81db47104b3d077.pdf
    • https://cdn.shopify.com/s/files/1/0436/1555/1645/files/aviation_logo_templates.pdf
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/82027315718.pdf
    • https://cdn.shopify.com/s/files/1/0434/6930/8061/files/bibetafeve.pdf
    • https://cdn.shopify.com/s/files/1/0432/8259/6004/files/tolixizijuxu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1663/4016/files/dulerijojubuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/how_to_download_streaming_video_chrome.pdf
    • https://cdn.shopify.com/s/files/1/0431/8789/6480/files/united_airlines_gate_information_sfo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5321/2057/files/38692251200.pdf
    • https://cdn.shopify.com/s/files/1/0431/2036/1629/files/fevosubupuj.pdf
    • https://cdn.shopify.com/s/files/1/0438/0796/5341/files/bisugijefesoxemal.pdf
    • https://cdn.shopify.com/s/files/1/0431/1141/5965/files/nopigovopelutuxa.pdf
    • https://cdn.shopify.com/s/files/1/0430/3018/4087/files/katotomo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9318/1081/files/49738814605.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c41.bin
50cdae4f11e21ba901aed01e33bdd6e07f8ac333cacff19a27834aa74b969ac5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C41 5080 bytes
font_01_sfnt_off00007d55.bin
d46088e12c72d8fdbd2ba5d23d785f934c4cbf284615f2a0b862c590bfccb00c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D55 9932 bytes
font_02_sfnt_off00009f4d.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F4D 4324 bytes

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