Malicious PDF — malware analysis report

Static analysis result for SHA-256 62bdfdb5f19dcaa8…

MALICIOUS

PDF

51.5 KB Created: 2020-08-02 12:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1ff15f707937da3dd5f4b4005f6c302 SHA-1: 37557b1283d6aeb75db15857fd0b42144c496953 SHA-256: 62bdfdb5f19dcaa8a0c9b4e5007a87daf96854671e8524b2e30e674aab0b47d2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that leads to this redirector. This suggests an attempt to direct users to malicious content, 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.ru/pify?keyword=how+to+write+a+readme+file
    • http://files.safeagsafeschools.org/uploads/1/3/0/7/130776590/7206572.pdf
    • http://files.tahlequahtrails.org/uploads/1/3/0/8/130874086/1607821.pdf
    • http://files.mgeducation.net/uploads/1/3/2/6/132682627/525561.pdf
    • http://files.albcountry.co.uk/uploads/1/3/1/3/131397946/porijubemerupom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/5358/0439/files/67295736581.pdf
    • https://cdn.shopify.com/s/files/1/0438/0514/7298/files/black_and_decker_grass_trimmer.pdf
    • https://cdn.shopify.com/s/files/1/0432/0310/0832/files/types_of_algebra.pdf
    • https://cdn.shopify.com/s/files/1/0437/5497/9477/files/53463881901.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/malerofefamizekigo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1848/5923/files/bopesomizexanaf.pdf
    • https://cdn.shopify.com/s/files/1/0437/1103/7591/files/xitesudovisugijotenorowus.pdf
    • https://cdn.shopify.com/s/files/1/0432/1152/2209/files/55085743816.pdf
    • https://cdn.shopify.com/s/files/1/0430/3673/7699/files/12462441060.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38692385895.pdf
    • https://cdn.shopify.com/s/files/1/0435/3048/5915/files/40110336848.pdf
    • https://cdn.shopify.com/s/files/1/0434/0567/2597/files/tuwuxufusanumixar.pdf
    • https://cdn.shopify.com/s/files/1/0428/7243/8947/files/wugogaforefa.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_off00007e1a.bin
70d2350603c7c3b2cd08e1119ce9aa1a5fcbfea0c85e912fd00812985dae3bfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E1A 4612 bytes
font_01_sfnt_off00008dce.bin
329baad05ab98a4b8763b4223e3ab85ae7fec091a1ddd09a18cee3239749f3fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DCE 10848 bytes
font_02_sfnt_off0000b2f1.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F1 4324 bytes

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