Malicious PDF — malware analysis report

Static analysis result for SHA-256 8adf15ebfa37bc60…

MALICIOUS

PDF

41.2 KB Created: 2020-08-14 07:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f41561a8f138d41643d61597611bea26 SHA-1: 8c03c064b640405061c3fff18d5704b33a8c4231 SHA-256: 8adf15ebfa37bc6027032050c993526175f31ace04042f44c1745d045681287e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm and a malicious redirector URL, indicating a phishing or scam attempt. The primary malicious URL is https://ttraff.com/pify?keyword=decimal+addition+and+subtraction+worksheets+grade+6, which is likely used to lure victims into downloading further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=decimal+addition+and+subtraction+worksheets+grade+6
    • http://files.icrme.net/uploads/1/3/1/6/131637365/513789.pdf
    • http://files.naijalink.eu/uploads/1/3/0/7/130775282/c4381f9ecbf8.pdf
    • http://files.mrwhitcher.com/uploads/1/3/1/3/131380889/nulivulamibixi.pdf
    • http://files.berkeleybeast.com/uploads/1/3/1/4/131437119/719136b779f.pdf
    • http://files.westriseelectric.com/uploads/1/3/1/4/131407102/40747d004.pdf
    • https://cdn.shopify.com/s/files/1/0437/4318/2999/files/pdf_booklet_printing_wrong_order.pdf
    • https://cdn.shopify.com/s/files/1/0433/2178/6521/files/77706001009.pdf
    • https://cdn.shopify.com/s/files/1/0431/4539/6386/files/53760622848.pdf
    • https://cdn.shopify.com/s/files/1/0447/0823/3369/files/minecraft_regrowth_tips.pdf
    • https://cdn.shopify.com/s/files/1/0430/0495/2735/files/risk_management_and_insurance_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/7098/0245/files/70708998122.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/capital_cities_of_all_countries.pdf
    • https://cdn.shopify.com/s/files/1/0437/1290/5370/files/files_2_folder.pdf
    • https://cdn.shopify.com/s/files/1/0427/9785/8972/files/anne_of_green_gables_story_summary.pdf
    • https://cdn.shopify.com/s/files/1/0428/5123/8047/files/jdk_8_features_with_examples.pdf
    • https://cdn.shopify.com/s/files/1/0433/9017/3333/files/materiales_dentales_macchi_pdf_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0433/4993/4229/files/wusenipu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6674/4220/files/boxesuzaxo.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061ef.bin
062684fdcedf5ce936979ab30e33644c2162ac6921b022ad2dd50734137eff9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61EF 5800 bytes
font_01_sfnt_off0000758e.bin
03028bd7382373342809b667bd5826616304ab8ea592d6a6e583563d728e483c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x758E 10052 bytes

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