Malicious PDF — malware analysis report

Static analysis result for SHA-256 697211a497933b22…

MALICIOUS

PDF

41.9 KB Created: 2020-08-17 04:39:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 262f187b00c842348db8094555b6f39a SHA-1: e31b66d882e292eb43ec24954e64e9fe4aca50ba SHA-256: 697211a497933b228d3a9170b713115ba969cae187e586de73ed9f45e529ca68
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically a URL related to 'payment slip template excel'. The document body also contains this URL and numerous other PDF links, many of which point to potentially untrusted domains. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be a phishing lure designed to trick users into visiting a malicious site.

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=payment+slip+template+excel
    • http://files.bonneygirlphotography.com/uploads/1/3/2/6/132681204/sapoxorufewodod.pdf
    • http://xejijofop.elbaalchamber.com/uploads/1/3/2/7/132741555/nebazisutonekij_darixudotorotid_jagivinalonupan.pdf
    • http://rekugun.cahillshpall.com/uploads/1/3/0/7/130775971/xedegirazup-sufod.pdf
    • http://ruxowike.stuartbmeyers.com/uploads/1/3/0/9/130969539/zexoduwifekobapo.pdf
    • http://mefowore.bachmansfarmstore.online/uploads/1/3/0/8/130874474/8b1f3364f92.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/3649/0398/files/b_arch_paper_2.pdf
    • https://cdn.shopify.com/s/files/1/0432/5559/5172/files/54229810830.pdf
    • https://cdn.shopify.com/s/files/1/0435/3445/0840/files/huawei_mate_10_pro_update_android_pie.pdf
    • https://cdn.shopify.com/s/files/1/0437/9423/5553/files/income_tax_slab_assessment_year_2020_18.pdf
    • https://cdn.shopify.com/s/files/1/0434/7111/0308/files/pudonewu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8523/4338/files/keregu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1535/6067/files/neborabaguzopigegeko.pdf
    • https://cdn.shopify.com/s/files/1/0440/5837/8392/files/78590409050.pdf
    • https://cdn.shopify.com/s/files/1/0431/9952/9120/files/xolunovafibotodakopirotu.pdf
    • https://cdn.shopify.com/s/files/1/0427/7446/2631/files/ridojifituwidivasadojun.pdf
    • https://cdn.shopify.com/s/files/1/0435/8173/5073/files/achieving_our_country_rorty.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/41547475318.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_off00006656.bin
350238567538cee2935c47237d3e0f8fd68a4992ebfdd1a16869141ab6b723ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6656 5156 bytes
font_01_sfnt_off000077d6.bin
ae78e043700e991754f46fc45b1e0f9bf932f514c763dcf77e70da4959fc87d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77D6 10052 bytes

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