Malicious PDF — malware analysis report

Static analysis result for SHA-256 024ba2e75b5795d1…

MALICIOUS

PDF

38.1 KB Created: 2020-08-09 22:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dec31caa0a8194dac0a6b9f036ab5251 SHA-1: 72cdf9b93ebd167b5cd1ec6c232a55d0bcd3365b SHA-256: 024ba2e75b5795d1b8f98c3117a3690ffe1b8a8686b8bec1149b9c97a1557f05
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to a harmful destination. The presence of a large number of external PDF links suggests a link farm or SEO manipulation tactic to obscure the malicious intent. 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=business+english+career+paths+express+publishing+pdf
    • http://files.defy-foundation.org/uploads/1/3/1/4/131483097/fidunaxuvepifedim.pdf
    • http://files.mindwindfilms.com/uploads/1/3/0/8/130873758/a3b829df.pdf
    • http://files.braveheartsinstitute.com/uploads/1/3/2/6/132683088/jidanelomigibalot.pdf
    • http://files.gmseatonauthor.com/uploads/1/3/1/8/131856072/tikotebowuzug.pdf
    • http://files.susiphotography.com/uploads/1/3/0/7/130739678/savufamari_bovawukumo_sunakivole_bibowemo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8575/8618/files/49236647635.pdf
    • https://cdn.shopify.com/s/files/1/0432/1676/5087/files/fifat.pdf
    • https://cdn.shopify.com/s/files/1/0439/3864/4123/files/advanced_analytics_with_spark_o_reilly_pdf_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/3487/7850/files/philips_universal_remote_setup.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fejatomamegebuwugibuvu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0055/1830/files/any_function_python.pdf
    • https://cdn.shopify.com/s/files/1/0433/6458/1525/files/24687590181.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zevuwuvufotolotatagonisex.pdf
    • https://cdn.shopify.com/s/files/1/0433/6805/4949/files/69096034372.pdf
    • https://cdn.shopify.com/s/files/1/0437/1313/4741/files/47511112088.pdf
    • https://cdn.shopify.com/s/files/1/0430/7389/6602/files/biotina_efectos_adversos.pdf
    • https://cdn.shopify.com/s/files/1/0433/8489/7701/files/15990174740.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_off00005595.bin
cc1856c45bb13f5dfa41e1e2c5ec95fcf2324de1c02b4236520c7be40a94b177		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5595 5676 bytes
font_01_sfnt_off000068e5.bin
fe69df7ac80cf32cc1f15ff88bbdaf22f94e4923e1dfe0db8497b2e494e2de8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68E5 10000 bytes

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