Malicious PDF — malware analysis report

Static analysis result for SHA-256 27adf3573bf76093…

MALICIOUS

PDF

42.9 KB Created: 2020-08-19 13:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31123425c266e826640f1d21efb2a102 SHA-1: 095a93c9d7836fb1c121842a1defca23421f7e61 SHA-256: 27adf3573bf7609387ad79312db08b3bf8fc5b97cc08a983e68bd3e7257ffaab
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though partially corrupted, contains text related to 'Caustic 3 app for android' and includes the malicious URL, suggesting a lure to download or interact with malicious content. The presence of a link farm further supports a malicious intent to distribute harmful content or drive traffic to malicious sites.

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=caustic+3+app+for+android
    • http://files.omgirl2013.net/uploads/1/3/0/8/130873945/dizogajetimo.pdf
    • http://files.fryeburgwaterdistrict.org/uploads/1/3/0/8/130814066/1487923.pdf
    • http://files.nlcoopertyres.co.nz/uploads/1/3/0/7/130775528/d8345acb.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kiwovanigefuminif.pdf
    • https://cdn.shopify.com/s/files/1/0454/7529/9478/files/dinesh_biology_class_10.pdf
    • https://cdn.shopify.com/s/files/1/0440/7646/6328/files/calculator_java_code.pdf
    • https://cdn.shopify.com/s/files/1/0431/0636/9697/files/dezefezufukowomokifajan.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0202/files/71553782158.pdf
    • https://cdn.shopify.com/s/files/1/0440/3301/5958/files/plant_transponder_arcadian_valley.pdf
    • https://cdn.shopify.com/s/files/1/0431/0879/4530/files/luwelojaborovenisagi.pdf
    • https://cdn.shopify.com/s/files/1/0434/8028/5348/files/small_size_reader_for_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0428/5077/9295/files/99489901301.pdf
    • https://cdn.shopify.com/s/files/1/0436/8387/2921/files/vewisizawofigog.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/clash_of_clans_trip_games_apk.pdf
    • https://cdn.shopify.com/s/files/1/0432/8456/2086/files/school_uniforms_uk_cotton.pdf
    • https://cdn.shopify.com/s/files/1/0429/0494/4807/files/48601338001.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0076/files/43484738062.pdf
    • https://cdn.shopify.com/s/files/1/0433/6631/8230/files/zubegideresani.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_off00006a10.bin
5c6886d06d01bdddba169bdfa2c65ac5131e3cabd855e0f72257b7ba564aeced		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A10 5184 bytes
font_01_sfnt_off00007bb9.bin
18df156d9b0fd9ad334cefee72187faae86a1a084ee305cfa8fe571ee3c2aabb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB9 10200 bytes

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