Malicious PDF — malware analysis report

Static analysis result for SHA-256 56e90afc60a43c4a…

MALICIOUS

PDF

46.1 KB Created: 2020-09-09 00:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c91d2ca4e9404c0d153c3f7adf5e67c7 SHA-1: 2cdba42b349b4053522e89183c1fdd27e3257341 SHA-256: 56e90afc60a43c4a246ac5e58204148285fbb1ab46b72cb6a320f43f3221e9df
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though heavily obfuscated, contains text related to 'bc grade 8 math free worksheets' and the malicious URL, suggesting a lure for educational content. The primary malicious URL is a redirector that likely leads to further malicious content.

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.club/pify?keyword=bc+grade+8+math+free+worksheets
    • https://cdn.shopify.com/s/files/1/0433/9105/8083/files/brothers_in_arms_full_pc_game.pdf
    • https://cdn.shopify.com/s/files/1/0435/8379/9459/files/personal_bill_of_rights.pdf
    • https://cdn.shopify.com/s/files/1/0438/0504/8994/files/nulurinawudipi.pdf
    • https://cdn.shopify.com/s/files/1/0436/9596/4328/files/78478898189.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/83390791822.pdf
    • https://static.usrfiles.com/ugd/cac9e4_9656366528b749b8976495ec6c1ead70.pdf
    • https://static.usrfiles.com/ugd/eda9ba_4a36f2de8df640c58fc34b48e26d34d9.pdf
    • https://static.usrfiles.com/ugd/538d67_cb8074ed6c29485cb537d0372c7eb5ff.pdf
    • https://static.usrfiles.com/ugd/b8c837_c59073c7963a49b8af6bf67d6d0986f0.pdf
    • https://static.usrfiles.com/ugd/53c654_704e6218f4964ca398b49efe9c8da65e.pdf
    • https://cdn.shopify.com/s/files/1/0434/8638/0189/files/bugasuramima.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/bujaz.pdf
    • https://cdn.shopify.com/s/files/1/0435/6443/3566/files/bojobadoreluzalagivoneden.pdf
    • https://cdn.shopify.com/s/files/1/0432/2652/9956/files/42951118703.pdf
    • https://cdn.shopify.com/s/files/1/0431/5086/8646/files/85460630317.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/maxix.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fikikotiv.pdf
    • https://cdn.shopify.com/s/files/1/0437/8414/3010/files/nalaruvuxojunubixedimobu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007440.bin
2f06b4e47628962d01eac1c13249cb8ebe19a91ced4342010c8b4d419f5e224f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7440 5804 bytes
font_01_sfnt_off000087e7.bin
5954335723bbea75c45f72f4cda9022ccd24cbe82a4fcddf9bcbc7140dc539ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87E7 10220 bytes

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