Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ef69b7d3317467…

MALICIOUS

PDF

46.1 KB Created: 2020-09-16 14:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02c134434ec031e6fd4523b87eeef1cd SHA-1: e88ebf1f2b21ccc22fe5e0c9ce2f63bfd8477a98 SHA-256: 79ef69b7d331746701d09057bc41d323339e2ab11400e53f55a6602336b5d2f0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to suspicious or unknown domains, indicating a link farm designed to redirect users. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that is also flagged by the redirector heuristic, suggesting an attempt to disguise malicious activity as educational content.

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.club/wix?keyword=multiplying+polynomials+coloring+activity+worksheet+answer+key+aliens+pdf
    • http://daliwize.nazhomeschoolers.org/uploads/1/3/1/0/131071258/60c4eb.pdf
    • http://files.elementalascension.com/uploads/1/3/1/4/131437953/gawogilopog.pdf
    • http://files.thedinopark.com/uploads/1/3/2/7/132740415/6535022.pdf
    • http://files.beverleycigarstore.com/uploads/1/3/0/9/130969403/dovonaxevesewog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://aeacac57-82f6-48db-af0c-cd17eb07d15a.filesusr.com/ugd/3225da_acae7881031c4761a38d917cd0a42052.pdf?index=true
    • https://52723aca-1f9f-4ce4-a509-bef15311c9c0.filesusr.com/ugd/dc8a8e_231ee2051782473cae3d82fcbaad5b44.pdf?index=true
    • https://dbd3c9c0-900a-4830-9e8a-e2f526370b1e.filesusr.com/ugd/6f5f23_6afaaf19dbd34e149235ecb7f7b9a5ab.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0434/7320/7446/files/fishing_report_brigantine_nj.pdf
    • https://cdn.shopify.com/s/files/1/0427/7587/1654/files/94258787447.pdf
    • https://cdn.shopify.com/s/files/1/0433/2158/9913/files/86488334162.pdf
    • https://cdn.shopify.com/s/files/1/0432/6955/4344/files/macroeconomics_20th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/4017/7314/files/borderlands_the_pre_sequel_trophy_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/5491/3950/files/59217321222.pdf
    • https://cdn.shopify.com/s/files/1/0427/8606/2495/files/engineering_drawing_question_and_answer.pdf
    • https://cdn.shopify.com/s/files/1/0427/6148/6503/files/happy_wheels_mod_apk_download_android_1.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065b4.bin
2b614eb305c98fa57339948373294fec81cc4f7d4c8d2f1da10ec2686e56905c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65B4 5776 bytes
font_01_sfnt_off00007946.bin
f6742dcb854c937899d000392306aabab013d9530c5815e71241fa3ec438d1db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7946 10228 bytes
font_02_sfnt_off00009c5c.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C5C 4324 bytes

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