Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb99c4759845dd4…

MALICIOUS

PDF

44.8 KB Created: 2020-09-18 18:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 226224e412a3e5b008272c6b7a24646d SHA-1: fa5676250bbbbf75ae4ce93af80df63aa420288a SHA-256: bfb99c4759845dd4ef6f5fe6579196c929db15ba476261d3dfdb2559f9ed0e67
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a primary link directing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'electrical resistance worksheet answers' and includes the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of a link farm heuristic further indicates an attempt to manipulate search engine results or distribute content through numerous links.

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.me/wix?keyword=electrical+resistance+worksheet+answers
    • http://files.unrestrainedshane.com/uploads/1/3/2/7/132710659/menuxejo.pdf
    • http://fakegepax.gabrielmpena.com/uploads/1/3/1/6/131608016/905311a.pdf
    • http://files.markjmusic.com/uploads/1/3/1/3/131379049/kumatewize.pdf
    • https://cdn.shopify.com/s/files/1/0428/3914/6662/files/bobolapinuni.pdf
    • https://cdn.shopify.com/s/files/1/0431/1800/2340/files/fiction_books_to_read_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/1962/2808/files/informal_letter_writing_topics.pdf
    • https://9f8f30aa-1c8b-4fd2-9865-38a1a4c5e7b7.filesusr.com/ugd/3eed2b_0008c61c7d7b445b8960b71176b65ced.pdf?index=true
    • https://21919e5c-34bd-40d1-b7fb-a90d501f3fa4.filesusr.com/ugd/2f3216_43c28be10e5e443a82f89219e883a5c6.pdf?index=true
    • https://64b7e65d-33f8-46f2-9199-353b91a93e8c.filesusr.com/ugd/66f3f9_283e3b98258243a4ae4a527b9fc598a0.pdf?index=true
    • https://44f9b859-bb14-4a88-89ba-ea3171303a0b.filesusr.com/ugd/db93e9_9e02cfc3c37b42a58ab945490e4bf541.pdf?index=true
    • https://bc614b54-6aa1-4907-828e-0bf1d829eb31.filesusr.com/ugd/2072cd_53d9da4608ed4d63a0fff50ef0ebc6de.pdf?index=true
    • https://e2b183df-450f-4cda-89b4-0e73a4e27b15.filesusr.com/ugd/99afdc_9ba0221c041b4fa7a92bdb138c8757da.pdf?index=true
    • https://75c30be6-ec5f-4d74-8895-7e11a7054ade.filesusr.com/ugd/162fe6_0cb45a8990d444ea98e7b969e741253a.pdf?index=true
    • 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_off0000632f.bin
f8d81b8f57ae0da46699a619f94f16c97e43e5d2803ace42c84e7b767fb312a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x632F 4788 bytes
font_01_sfnt_off00007370.bin
b6b40f66c93e615663c0945ee23b0a1a996c51dca2a3681905049cde278b6536		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7370 10828 bytes
font_02_sfnt_off000097fc.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97FC 4324 bytes

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