Malicious PDF — malware analysis report

Static analysis result for SHA-256 08798b637faf3dd1…

MALICIOUS

PDF

46.5 KB Created: 2020-08-29 21:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45d1497c90fab07568fdf20ef3a9bfb6 SHA-1: e18f11e4594c01adb52a4f02c74a0d67b7390cfb SHA-256: 08798b637faf3dd10fdc48c3f23c39588df0b72ec7b17889b51c8326e9b91790
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical redirector link pointing to malicious infrastructure. The document body, though heavily obfuscated, contains text related to a 'google cloud architect study guide pdf' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of multiple embedded links, many pointing to benign Shopify URLs, is likely an attempt to mask the malicious redirector.

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/wix?keyword=google+cloud+architect+study+guide+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30151397197.pdf
    • https://cdn.shopify.com/s/files/1/0434/7995/7669/files/alleluia_canon_mozart.pdf
    • https://cdn.shopify.com/s/files/1/0463/5079/4909/files/personal_budget_excel_sheet_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/5693/8646/files/polar_bonds_and_electronegativity_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/5430/9280/files/72327053593.pdf
    • https://static.usrfiles.com/ugd/b8c837_0a71ef40ea9d49809e09974973cf19bb.pdf
    • https://static.usrfiles.com/ugd/26938b_2942bf4d4ebc4f23a3de5a0c94997962.pdf
    • https://static.usrfiles.com/ugd/b8c837_3de69c04da594bbda791b531164c03b0.pdf
    • https://static.usrfiles.com/ugd/b8c837_49de9b72dd4b4994967c082c2c7f984e.pdf
    • https://cdn.shopify.com/s/files/1/0428/5969/2191/files/lesikavatul.pdf
    • https://cdn.shopify.com/s/files/1/0433/8355/4202/files/54334309272.pdf
    • https://cdn.shopify.com/s/files/1/0434/2117/1864/files/34920750505.pdf
    • https://cdn.shopify.com/s/files/1/0434/6462/2242/files/prefixes_and_suffixes_activities.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6285/files/79947676375.pdf
    • https://cdn.shopify.com/s/files/1/0452/3445/4688/files/bajarangi_kannada_movie_video_songs.pdf
    • https://cdn.shopify.com/s/files/1/0448/0784/8096/files/bindiya_bole_kya_bole_gana.pdf
    • https://cdn.shopify.com/s/files/1/0434/3880/1061/files/canon_in_d_violin_sheet_music_easy.pdf
    • https://cdn.shopify.com/s/files/1/0437/6271/2734/files/seventh_chords_piano.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_off00007765.bin
c6edfcc3402afbf73815eee11f24aebe81ea0baf2ed473c6805ac186555f7328		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7765 5548 bytes
font_01_sfnt_off00008a4d.bin
ee98e26204e14c3d1dfe301a32e5bd8ef2e7d94aef39608c1886616b9afaa995		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A4D 10040 bytes

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