Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe97ec4b90872372…

MALICIOUS

PDF

53.8 KB Created: 2020-08-13 16:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e86574891ebef6158e7d23e8852fa597 SHA-1: c1cbf4671577a5149619ec6b8e64c609c0da4905 SHA-256: fe97ec4b908723727ab1261806cbc33e7a9a4a76f28212df6c774714028d57fe
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a link to nursing notes. The document body also contains numerous links to external PDFs hosted on Shopify, likely part of a link farm to improve search engine ranking for malicious content. The ML classifier strongly flagged this PDF as malicious.

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=nursing+pathophysiology+notes+pdf
    • http://tozoxe.teachingreexplored.org/uploads/1/3/2/6/132680813/zasazegovexixapu.pdf
    • http://pizizu.soakitupfranklinma.org/uploads/1/3/2/3/132303382/dugalid.pdf
    • http://files.bettylous.com/uploads/1/3/1/3/131397938/7ae0e55f38.pdf
    • http://files.ophc.life/uploads/1/3/1/4/131437736/6681433.pdf
    • https://cdn.shopify.com/s/files/1/0438/2638/0960/files/nenapumuzinosef.pdf
    • https://cdn.shopify.com/s/files/1/0433/5347/3189/files/65356351937.pdf
    • https://cdn.shopify.com/s/files/1/0433/3545/0774/files/nobukipigofumexoluduvi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8237/5577/files/xeluzebawaregujesogu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/74832969368.pdf
    • https://cdn.shopify.com/s/files/1/0431/8891/2290/files/pixejabimekuvovoxe.pdf
    • https://cdn.shopify.com/s/files/1/0429/2945/5263/files/xolipixegidupasukaluxejut.pdf
    • https://cdn.shopify.com/s/files/1/0439/4981/8024/files/mubazipujot.pdf
    • https://cdn.shopify.com/s/files/1/0438/6711/1584/files/lixexuliwuv.pdf
    • https://cdn.shopify.com/s/files/1/0434/0740/9310/files/vurogopovoramidigorekoti.pdf
    • https://cdn.shopify.com/s/files/1/0431/5509/5712/files/animal_kingdom_disney_world_map.pdf
    • https://cdn.shopify.com/s/files/1/0432/1991/0820/files/cardo_santo_propiedades.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b2e.bin
c5acf866486c14e8348b2953cec3b5ff96dc40eaf88b7272efd05bc6c272d128		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B2E 5376 bytes
font_01_sfnt_off00008d7b.bin
abbc96e1cfae4cc6bfa19caa20a8e25b159ff08d8c46f2edece76aa994714e63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D7B 10576 bytes
font_02_sfnt_off0000b1a6.bin
6d7b14acb5cc961afde6567b41bd74085944f5944e8db2b72431a8c6ae57b581		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A6 16960 bytes

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