Malicious PDF — malware analysis report

Static analysis result for SHA-256 12fd5e38baa4c218…

MALICIOUS

PDF

46.2 KB Created: 2020-08-06 20:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd25d1c25895dd387f7839f26b68db59 SHA-1: 06e2af1e839266527df7a302f8f1c3a9d9176529 SHA-256: 12fd5e38baa4c218c6cccf8bd388778b4deb236ace6fe5efea7bf7ccfe8dfd5a
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, identified as a link farm, with a critical heuristic firing for a malicious redirector. The primary malicious URL, https://ttraff.ru/pify?keyword=ense%25C3%25B1anza+aprendizaje+definicion+pdf, is likely used to redirect users to further malicious content. The document body itself contains garbled text and the URL, suggesting it's a lure. No scripts were extracted, but the link farm and redirector indicate a malicious intent to lead users to harmful sites.

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=ense%25C3%25B1anza+aprendizaje+definicion+pdf
    • http://files.theprideofsouthside.com/uploads/1/3/0/7/130739393/90c92.pdf
    • http://files.christinaromerocross.com/uploads/1/3/1/6/131606289/38d59675.pdf
    • http://files.kcheartlandconference.com/uploads/1/3/2/7/132740250/savovetuzijag.pdf
    • http://files.kanimblainternational.com/uploads/1/3/1/1/131164431/7763173.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/6779/3817/files/35616036116.pdf
    • https://cdn.shopify.com/s/files/1/0437/9095/8749/files/vilisakiwi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5419/4070/files/soil_erosion_causes_and_prevention.pdf
    • https://cdn.shopify.com/s/files/1/0429/6946/4991/files/jolovopezijenotapoxokal.pdf
    • https://cdn.shopify.com/s/files/1/0431/7652/5984/files/90049053245.pdf
    • https://cdn.shopify.com/s/files/1/0428/7250/4483/files/76890293541.pdf
    • https://cdn.shopify.com/s/files/1/0433/2650/5118/files/27936136069.pdf
    • https://cdn.shopify.com/s/files/1/0433/8047/4014/files/kuwekofuwudogobibezut.pdf
    • https://cdn.shopify.com/s/files/1/0432/3426/3199/files/82880757230.pdf
    • https://cdn.shopify.com/s/files/1/0429/6887/5157/files/simeloxozasutel.pdf
    • https://cdn.shopify.com/s/files/1/0435/3127/2351/files/46568080368.pdf
    • https://cdn.shopify.com/s/files/1/0437/8345/4871/files/28944679543.pdf
    • https://cdn.shopify.com/s/files/1/0431/7646/0447/files/62779418012.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_off00006741.bin
70a34e973aeeb348c42b11ce4f138bd9b490ff4b6a8fc34ec05cdf9b38a62067		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6741 5120 bytes
font_01_sfnt_off0000786e.bin
e7b468a6680bde1cf63b72eb462ba34169a91f7dec2f7be252ed8a40ec2bf150		 pdf-font-stream PDF embedded font (sfnt) at offset 0x786E 10680 bytes
font_02_sfnt_off00009b4c.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B4C 4324 bytes

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