Malicious PDF — malware analysis report

Static analysis result for SHA-256 45943b115ebf2dce…

MALICIOUS

PDF

38.4 KB Created: 2020-08-07 07:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0af17ad1a1df135fa504813e71fda086 SHA-1: ac9c6e210e0f81cd931ccb931c904fcf7feb45e4 SHA-256: 45943b115ebf2dce0aa12173a9ef0d7a7ce32680ca2cd7e9fbfb985a5fa4df1b
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'Bowflex revolution assembly pdf'. The primary malicious URL identified is https://ttraff.com/pify?keyword=bowflex+revolution+assembly+pdf, which is likely used to redirect users to further malicious content. The presence of numerous links, many hosted on Shopify, suggests an attempt to create a link farm for SEO poisoning or to obscure the final malicious destination.

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=bowflex+revolution+assembly+pdf
    • http://gogesife.sparrowhillinn.com/uploads/1/3/0/7/130738970/kidegokotukug.pdf
    • http://tonap.treeoflifeph.com/uploads/1/3/0/8/130814017/roliderago_mowop.pdf
    • http://bazuwide.linlithgowscdc.org/uploads/1/3/1/3/131383314/ddb2793f43.pdf
    • https://cdn.shopify.com/s/files/1/0431/0266/6906/files/66757734929.pdf
    • https://cdn.shopify.com/s/files/1/0434/3165/7638/files/tawufuxizawajomemuturos.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/contrarian_investing.pdf
    • https://cdn.shopify.com/s/files/1/0439/4775/3640/files/74560479484.pdf
    • https://cdn.shopify.com/s/files/1/0436/3524/5214/files/canvas_uky_edu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/petapabaxur.pdf
    • https://cdn.shopify.com/s/files/1/0431/6656/4507/files/5125556900.pdf
    • https://cdn.shopify.com/s/files/1/0431/4926/3004/files/storytelling_with_data_wiley_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/6114/8837/files/xulagetigugawemu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4942/6839/files/21896798968.pdf
    • https://cdn.shopify.com/s/files/1/0437/9040/1685/files/business_law_text_and_cases.pdf
    • https://cdn.shopify.com/s/files/1/0434/1671/5429/files/gedodopubok.pdf
    • https://cdn.shopify.com/s/files/1/0439/1400/2587/files/astrologa_maya.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000046c1.bin
d9167c1068b29b87720c5582eac4f0885f2f8c76ada75fef9b60a9b7632532df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46C1 5580 bytes
font_01_sfnt_off000059bd.bin
9ab143ef5367e4f219c55a84b9c07d902f8905cb29daab39549e2514706580f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59BD 10488 bytes
font_02_sfnt_off00007cd6.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CD6 4324 bytes

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