Malicious PDF — malware analysis report

Static analysis result for SHA-256 781c698fe063f56a…

MALICIOUS

PDF

39.1 KB Created: 2020-08-10 22:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e545b1b1f6bf9dd4e7c2bf7878f21250 SHA-1: 78f4f075cca46f1850b3060df08ade4e16532547 SHA-256: 781c698fe063f56a60bbd51090f48933352fcd1672c44344988c55af8fdda280
162 Risk Score

Malware Insights

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

The PDF contains numerous links, including one identified as a malicious redirector. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to redirect users to harmful content. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to deliver a payload or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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.cc/pify?keyword=multiplying+polynomials+box+method+worksheet+pdf
    • http://files.ajitourservices.com/uploads/1/3/1/8/131856380/6510508.pdf
    • http://files.secretbutterflyboutique.com/uploads/1/3/2/6/132695883/9c40ff36eb602f.pdf
    • http://files.bombaybazaar.com/uploads/1/3/1/4/131482887/pevotiwulu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/poxusulijupidokubeb.pdf
    • https://cdn.shopify.com/s/files/1/0434/3028/1381/files/gozanenunidezumov.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kosetomamevisired.pdf
    • https://cdn.shopify.com/s/files/1/0433/6055/1070/files/python_pivot_table.pdf
    • https://cdn.shopify.com/s/files/1/0431/0463/2998/files/53990195502.pdf
    • https://cdn.shopify.com/s/files/1/0432/0601/7186/files/netgear_n150_wireless_usb_adapter.pdf
    • https://cdn.shopify.com/s/files/1/0433/7994/9718/files/favasopupesetaxixuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/7053/8406/files/petufefe.pdf
    • https://cdn.shopify.com/s/files/1/0431/8406/2626/files/borderlands_2_premiere_club.pdf
    • https://cdn.shopify.com/s/files/1/0434/4909/0200/files/midgard_heroes_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0435/5840/4259/files/wade_organic_chemistry_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/3503/3757/files/ronibezupugavakise.pdf
    • https://cdn.shopify.com/s/files/1/0432/1165/3279/files/budget_2020_malta.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_off000058de.bin
6065f006cb60958c1af371bf25c4559ed7b4fc2ea735f2702795a25c539bed69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58DE 5924 bytes
font_01_sfnt_off00006cf1.bin
0951cae054a28d7d008e12c7df1df1b38f95140858d1cf039a9c44dc2ef577d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CF1 9948 bytes

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