Malicious PDF — malware analysis report

Static analysis result for SHA-256 74918534a4d52a3f…

MALICIOUS

PDF

39.8 KB Created: 2020-08-29 14:38:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c4f954d752a974580c523146dd6b507 SHA-1: cad02bcd804b0b18f9928e8f3f15462c68420792 SHA-256: 74918534a4d52a3f35084ec149adca7d9d6c16dc63cac0ee703a18f913b52017
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically identified as a malicious redirector. This suggests the document's primary purpose is to lure users to malicious websites, likely for phishing or malware distribution. The ML classifier also strongly indicated maliciousness.

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.club/wix?keyword=viol%252Fdt+conv%252Fdt+sec%252Fviol+dkt%252Fno+disp
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_03b346ecdfe244d6a691f349a32ad0e0.pdf
    • https://static.usrfiles.com/ugd/b8c837_40d1519768de4423a4f0c07f2cd1766f.pdf
    • https://static.usrfiles.com/ugd/b8c837_304c82db875343c7814cc21b1dfc30bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_303232f9f404437f857f283d6736e7b7.pdf
    • https://cdn.shopify.com/s/files/1/0440/5320/1046/files/gufaba.pdf
    • https://cdn.shopify.com/s/files/1/0438/5603/6005/files/lotte_chemical_indonesia_annual_report.pdf
    • https://cdn.shopify.com/s/files/1/0428/9586/8067/files/2010_dodge_journey_repair_manual_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/photo_background_eraser_apk.pdf
    • https://cdn.shopify.com/s/files/1/0440/7810/4728/files/savage_divide_treasure_map_8.pdf
    • https://cdn.shopify.com/s/files/1/0435/8668/3037/files/40288894711.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xigazisamakolomomabixefox.pdf
    • https://cdn.shopify.com/s/files/1/0436/8669/0969/files/nofewenemirinob.pdf
    • https://cdn.shopify.com/s/files/1/0461/8318/6585/files/berger_paints_colour_chart.pdf
    • https://cdn.shopify.com/s/files/1/0463/0777/0528/files/bajadexofifamivebesiwipem.pdf
    • https://cdn.shopify.com/s/files/1/0457/3783/6710/files/extruded_aluminum_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/7058/7029/files/kepinigoxirax.pdf
    • https://cdn.shopify.com/s/files/1/0428/7250/4483/files/lejagodazifawijarasugikat.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_off00005d78.bin
1c1dd214073a3b2b19f386420a86f3deb4655ad5d9442682e2992f490d3e7fc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D78 4888 bytes
font_01_sfnt_off00006e42.bin
166e52aae3fe0162724cbdf21174c8a0af6fc3c2b5474c6e49e8040ad266996a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E42 10476 bytes

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