Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e33ac7d3d60cd61…

MALICIOUS

PDF

43.0 KB Created: 2020-07-15 18:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7cf34cb484b83c96487255962b19b0dc SHA-1: 0d484c596313316fbad1ac972f2eea000cc1b228 SHA-256: 6e33ac7d3d60cd61dc2edb8670238603be77c18808ef0487cdaab43591151e50
154 Risk Score

Malware Insights

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

The PDF contains numerous links to a link farm, with one primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to educational materials. The presence of embedded links and the overall structure strongly indicate an attempt to redirect 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.com/pify?keyword=9th+grade+math+notes+pdf
    • http://files.ironkoi.com/uploads/1/3/0/8/130873795/c6b3e610.pdf
    • http://files.exit18equipment.com/uploads/1/3/0/7/130776878/539a07731bcc5.pdf
    • http://files.mymgss.com/uploads/1/3/1/4/131453396/5955457.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://lituserer.files.wordpress.com/2020/07/kulofujomemojinuxel.pdf
    • https://forakij.files.wordpress.com/2020/07/66657577661.pdf
    • https://fifazosojavo.files.wordpress.com/2020/07/46978362950.pdf
    • https://kuvowiv.files.wordpress.com/2020/06/59683741199.pdf
    • https://pisurika.files.wordpress.com/2020/07/57712312769.pdf
    • https://xujijazewuf.files.wordpress.com/2020/06/29506227206.pdf
    • https://munovemam.files.wordpress.com/2020/07/jajunajafaxulusumewe.pdf
    • https://cdn.shopify.com/s/files/1/0432/7371/5880/files/xetawobokejopubiradugibu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/45965065757.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6166/files/xotopawilopimapaxibisetu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6978/3720/files/68198167783.pdf
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/69660816922.pdf
    • https://cdn.shopify.com/s/files/1/0429/6150/2362/files/kebidikotezitodinudi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rapuz.pdf
    • https://cdn.shopify.com/s/files/1/0429/3260/0985/files/53023691475.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wetidolurat.pdf
    • https://cdn.shopify.com/s/files/1/0433/4508/4574/files/dilibudasuwopoziv.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_off00006b66.bin
1c975b52e851a0c404d7964b062337f2524b3e732d8d1cfbd6101acb80f67084		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B66 5224 bytes
font_01_sfnt_off00007cfc.bin
d8788bc497138e38e986ed4d09a0f660f60b28bbff8373c9eb579ecce7693226		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CFC 9940 bytes

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