Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ca824e55d24cbe…

MALICIOUS

PDF

55.5 KB Created: 2020-08-22 10:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e92932ac2adf97231ab6083ab91c0a24 SHA-1: cc4385c13837d1ea9a618b35fa6fb86f94791417 SHA-256: 81ca824e55d24cbef6b6d8330dae038f647f9d98fbe587b900d6988e7492294b
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious or SEO-spam related domains, indicating a link farm or redirection tactic. The primary malicious URL identified is a redirector designed to lead users to further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

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=physical+properties+of+activated+carbon+pdf
    • http://kubimire.shonscience.com/uploads/1/3/1/4/131453526/judinitorolojun-zesusekuzivavuj.pdf
    • http://files.correctyourconcrete.com/uploads/1/3/1/3/131379362/xijokerora_jitusaxasusole.pdf
    • http://fozabiz.pairtradingpro.com/uploads/1/3/1/6/131637030/6fa001.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/4745/1798/files/mito_di_amore_e_psiche.pdf
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/marine_biogeochemistry.pdf
    • https://cdn.shopify.com/s/files/1/0430/7176/6677/files/45044870165.pdf
    • https://cdn.shopify.com/s/files/1/0430/5249/9098/files/9903525784.pdf
    • https://cdn.shopify.com/s/files/1/0432/6031/3768/files/45729720203.pdf
    • https://cdn.shopify.com/s/files/1/0435/2717/6344/files/9396501210.pdf
    • https://cdn.shopify.com/s/files/1/0433/3748/2405/files/xuveguw.pdf
    • https://cdn.shopify.com/s/files/1/0432/9439/2485/files/wordly_wise_3000_book_5_fourth_edition_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0402/files/blackberry_keyone_android_8_oreo.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_off00008cc7.bin
b108262c809984001e468b190edff941d3b8bede68c648a8cf38e8db493934da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CC7 5336 bytes
font_01_sfnt_off00009eda.bin
ea740783aa9641abd323248a685899d5ec74524cd7fb93b60301a59bd0cdbde6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EDA 10584 bytes
font_02_sfnt_off0000c2f9.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F9 4324 bytes

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