Malicious PDF — malware analysis report

Static analysis result for SHA-256 04419588b469878e…

MALICIOUS

PDF

49.3 KB Created: 2020-08-11 03:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b12f986ac715b64431258e12415e4da SHA-1: 302cf851f6dce8152e0659a0671b43a58a736f44 SHA-256: 04419588b469878e997dcad59d0a8d7e9964ad2b0fd8c3e560fcf47033716029
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 external PDF files hosted on various domains, suggesting a link farm or redirection scheme. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=abituriyent+1+8+matematika+pdf'. The document body, though heavily obfuscated, contains references to academic material ('abituriyent 1 8 matematika pdf') and the authoring application 'wkhtmltopdf', indicating a potential lure to disguise malicious activity. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=abituriyent+1+8+matematika+pdf
    • http://kuzibo.drinkeuphoriacoffee2go.com/uploads/1/3/0/7/130739592/wagubaj-gudoporades-zejofer.pdf
    • http://divegewu.craigengstrom.ninja/uploads/1/3/2/6/132696021/69eded.pdf
    • http://kuwuw.mittenswellness.com/uploads/1/3/2/8/132814930/suxizowod.pdf
    • http://files.barbarabemisadams.com/uploads/1/3/0/8/130874587/0f97829ef.pdf
    • http://files.elibarak.com/uploads/1/3/0/7/130739247/lugikulidoji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/2852/7779/files/popigibulugodikebosemuve.pdf
    • https://cdn.shopify.com/s/files/1/0437/4600/1045/files/schools_of_psychology_behaviorism.pdf
    • https://cdn.shopify.com/s/files/1/0431/6063/3504/files/71585005950.pdf
    • https://cdn.shopify.com/s/files/1/0435/6957/8147/files/mental_math_worksheets_grade_7.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/join_and_word.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0094/files/88584981791.pdf
    • https://cdn.shopify.com/s/files/1/0431/1705/2066/files/centrales_hidroelectricas_en_el_peru.pdf
    • https://cdn.shopify.com/s/files/1/0427/4916/5734/files/2957151827.pdf
    • https://cdn.shopify.com/s/files/1/0433/9639/9269/files/admin_staff_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0437/2008/1563/files/electrocardiograma_normal.pdf
    • https://cdn.shopify.com/s/files/1/0431/6728/5410/files/79108983050.pdf
    • https://cdn.shopify.com/s/files/1/0437/8699/3816/files/buck_converter_datasheet.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_off0000786d.bin
b392e7aedb525960d6838629cba23fe1a5ff1e6f51c11c0178c3750fff9b82a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x786D 5516 bytes
font_01_sfnt_off00008b25.bin
75ed46ebcb1e7a7b2762193dc47c328c6707f3876aa1080476581ac38d82016a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B25 15292 bytes

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