Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dbf16cd1713ef18…

MALICIOUS

PDF

41.0 KB Created: 2020-08-15 01:37:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b232ddb644d2f22db9659dd3e831f63c SHA-1: a1f309f838fad2556cd1f29591ab91190028a483 SHA-256: 5dbf16cd1713ef18a9002bd700e64dc633fedf4c93d4d6864de61d9084e25396
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service identified as malicious. The document body is obfuscated but contains a URL that appears to be part of the lure. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or phish users.

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=berthing+report+of+kakinada+port
    • http://files.corijacobs.com/uploads/1/3/1/3/131380438/zinopexum.pdf
    • http://files.theshrubberyllc.com/uploads/1/3/1/4/131406269/197277.pdf
    • http://files.rebekahlpurdy.com/uploads/1/3/0/7/130775402/kavuturogudawexemam.pdf
    • http://tikerug.reiver.life/uploads/1/3/1/4/131483254/cc6058e0b0e0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9829/9813/files/kibisafekilikofamane.pdf
    • https://cdn.shopify.com/s/files/1/0437/0120/7193/files/imagery_worksheets_for_elementary.pdf
    • https://cdn.shopify.com/s/files/1/0428/8564/4447/files/pubufosunew.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/luvibuxunefipefijuli.pdf
    • https://cdn.shopify.com/s/files/1/0431/5326/0700/files/muripuvonawuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/4952854333.pdf
    • https://cdn.shopify.com/s/files/1/0434/2241/7047/files/learn_beginner_spanish_bundle.pdf
    • https://cdn.shopify.com/s/files/1/0435/9228/6363/files/54530386750.pdf
    • https://cdn.shopify.com/s/files/1/0431/4241/4493/files/52410003680.pdf
    • https://cdn.shopify.com/s/files/1/0430/3942/4669/files/vegibavorisigezox.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/woziki.pdf
    • https://cdn.shopify.com/s/files/1/0437/3472/8853/files/download_surah_ar_rahman_latin.pdf
    • https://cdn.shopify.com/s/files/1/0436/0847/3763/files/cambridge_igcse_english_as_a_second_language_coursebook_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/9593/9488/files/zomajazuro.pdf
    • https://cdn.shopify.com/s/files/1/0432/0536/1821/files/41621946710.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_off0000614c.bin
fff03efefddb3185d1e660af92d15e894bc61e524ebaa24ced0de9fde3010a84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x614C 5208 bytes
font_01_sfnt_off00007300.bin
031c3c6e6dc7690b9e2d80ad4f7798caa6a5a80db6735a8440c2b493a5a7102f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7300 10740 bytes

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