Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b45805f63b5299…

MALICIOUS

PDF

42.8 KB Created: 2020-08-08 12:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7108b601451d59ba2e9c754ba656c43 SHA-1: 262caf5bbd303f3c27592cef0ec3420016952583 SHA-256: 70b45805f63b52997255f4fe71dec788c74debec6f3a28691e4776c183d12a4b
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as an economics PDF, which leads to a link farm of 18 other PDFs. The ML classifier strongly indicated maliciousness, and the embedded URL points to known malicious infrastructure. While no scripts were extracted, the PDF structure and embedded links suggest an attempt to direct users to potentially 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.com/pify?keyword=curso+basico+de+economia+pdf
    • http://peweg.sunshine-learning.com/uploads/1/3/1/3/131380600/jegesarufux_kibeloririnez_rojurox.pdf
    • http://files.realestatehelm.com/uploads/1/3/0/8/130814279/muxikulapajoz_gatanima.pdf
    • http://files.southeasterntruckbody.com/uploads/1/3/0/8/130874671/8fb531b3df9eb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0204/4316/files/iowa_math_test_6th_grade_practice.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2691/files/47396874201.pdf
    • https://cdn.shopify.com/s/files/1/0427/8901/1612/files/suporifafakerivojuzapap.pdf
    • https://cdn.shopify.com/s/files/1/0445/8492/7396/files/zolpidem_tartrate_davis.pdf
    • https://cdn.shopify.com/s/files/1/0427/4618/3847/files/vipabefajuretopamebe.pdf
    • https://cdn.shopify.com/s/files/1/0431/7141/4173/files/6512918211.pdf
    • https://cdn.shopify.com/s/files/1/0435/0319/0181/files/86163489901.pdf
    • https://cdn.shopify.com/s/files/1/0434/4581/3414/files/root_mean_square_error_formula.pdf
    • https://cdn.shopify.com/s/files/1/0437/2388/2664/files/70651069287.pdf
    • https://cdn.shopify.com/s/files/1/0428/4681/4374/files/3906400.pdf
    • https://cdn.shopify.com/s/files/1/0434/3431/1845/files/pejise.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16946396068.pdf
    • https://cdn.shopify.com/s/files/1/0431/9015/7473/files/98517979341.pdf
    • https://cdn.shopify.com/s/files/1/0439/3458/0891/files/bojanumor.pdf
    • https://cdn.shopify.com/s/files/1/0434/4525/6352/files/clip_jam_manual.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_off000065b3.bin
6bc97016406ff6bcf8d830cc1919edc495eafd5f427f6e4c4abc2b44a4f5c526		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65B3 5316 bytes
font_01_sfnt_off000077a6.bin
849232aa1e0ee584459385461cfcb4237fe8427fa35192c1374d6df811dd8b7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77A6 11404 bytes

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