Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd638d640ebc408…

MALICIOUS

PDF

49.4 KB Created: 2020-07-16 18:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f398c5d8b2d6c603acaccacc54aaf55 SHA-1: cafda0eea1fb89cec138b0bf2bc8550756961e42 SHA-256: 5dd638d640ebc408d440adf6714142163105b79b298e24c22d9c7a6d57f2af1b
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One of these links, 'https://ttraff.ru/wb?keyword=implementasi%20pancasila%20pdf', points to known malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the nature of the embedded links and the ML classification strongly suggest a malicious intent to redirect users to harmful 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.ru/wb?keyword=implementasi%20pancasila%20pdf
    • http://files.eagletheatrecompany046.com/uploads/1/3/0/7/130740183/c8059.pdf
    • http://files.harrydolan.com/uploads/1/3/1/8/131871951/9858780.pdf
    • http://files.jamesedwardbecton.com/uploads/1/3/1/4/131453350/2714723.pdf
    • http://files.gathering-of-light.com/uploads/1/3/1/4/131407734/1981766.pdf
    • http://files.plannedaspects.com/uploads/1/3/1/6/131637385/89f461.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://kikibok.files.wordpress.com/2020/07/tukekiwubivugujabibujo.pdf
    • https://vajokipoz.files.wordpress.com/2020/07/59287710365.pdf
    • https://lezetasido.files.wordpress.com/2020/07/zukuzepitunimedaparukesob.pdf
    • https://keganuforuro.files.wordpress.com/2020/07/38125575926.pdf
    • https://divajavat.files.wordpress.com/2020/07/16929949112.pdf
    • https://tezufaxaji.files.wordpress.com/2020/06/28703330843.pdf
    • https://ratekoxon.files.wordpress.com/2020/06/viwedofojuba.pdf
    • https://cdn.shopify.com/s/files/1/0432/2718/5309/files/wifabobomekufexufomefob.pdf
    • https://cdn.shopify.com/s/files/1/0429/9830/0823/files/natefelop.pdf
    • https://cdn.shopify.com/s/files/1/0432/3416/4893/files/4277423715.pdf
    • https://cdn.shopify.com/s/files/1/0432/4104/6171/files/19695445240.pdf
    • https://cdn.shopify.com/s/files/1/0429/8991/2218/files/91731707110.pdf
    • https://cdn.shopify.com/s/files/1/0430/6763/7917/files/77447989523.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9574/files/rinoxababakufufi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zadolodiwifunum.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008698.bin
9967db6c40feba490c5fa8ac26718b9814d5317dfa74605197c376c7d1f1e333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8698 4820 bytes
font_01_sfnt_off000096d2.bin
0768ca8bc74366fa103c0b891493ae15d072fd5ad2f7a4f6a1d0edbca2adea34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96D2 9744 bytes

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