Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1d138fd9b41f6f…

MALICIOUS

PDF

44.1 KB Created: 2020-08-21 22:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 757e3f7eaf39b6b9265b895955fb86d2 SHA-1: 610b3a3f92a444a43309ac9d324eacdcc97d944b SHA-256: 5f1d138fd9b41f6f92d8cb99b3446dcd0148a7790d0180383dc241218a0cb128
170 Risk Score

Malware Insights

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

The PDF document contains embedded links, with one specifically identified as a malicious redirector. The document body text and heuristic firings suggest a lure related to an application form, aiming to trick users into clicking the malicious link. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence indicate a malicious intent to redirect the user to harmful infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=bses+online+new+connection+application+form
    • http://files.dspespta.com/uploads/1/3/0/8/130874115/jururer.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5340/8675/files/xarizonalitu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0962/1665/files/zotulepotarepitafarolara.pdf
    • https://cdn.shopify.com/s/files/1/0437/2522/6152/files/kofiridevaxomezumewopez.pdf
    • https://cdn.shopify.com/s/files/1/0437/9190/9025/files/mugot.pdf
    • https://cdn.shopify.com/s/files/1/0429/7555/9829/files/14598932474.pdf
    • https://cdn.shopify.com/s/files/1/0428/5097/5910/files/34762479972.pdf
    • https://cdn.shopify.com/s/files/1/0434/9100/0472/files/zixanunux.pdf
    • https://cdn.shopify.com/s/files/1/0431/0079/9140/files/21173464713.pdf
    • https://cdn.shopify.com/s/files/1/0430/3486/9921/files/android_action_bar_back_button_animation.pdf
    • https://cdn.shopify.com/s/files/1/0429/8830/6586/files/abide_with_me_score.pdf
    • https://cdn.shopify.com/s/files/1/0429/0255/2742/files/87241051947.pdf
    • https://cdn.shopify.com/s/files/1/0459/7006/3520/files/58073229992.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_off00006dd0.bin
a7d48ee85e9f6dd0ca4f34ead3f19b5919b6dd4cfe23f14f4d86d36db0dd5f30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD0 5300 bytes
font_01_sfnt_off00007fd5.bin
0ad86a5f42dbb83108138e45200df2a55e696d674524ce0bdd40b658ab249693		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FD5 10404 bytes

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