Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1abe2d91dd3275…

MALICIOUS

PDF

54.3 KB Created: 2020-07-31 13:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e33fb4c107e881d43a0c05676ade59f SHA-1: 417f9ebb64e2a455e796bd1903902f91e454fa3f SHA-256: 9b1abe2d91dd32756dd8f35543f5ca110c43934f0250e59762f1eeada7522865
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. Additionally, it exhibits a PDF link farm heuristic, with numerous links to external PDFs hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be social engineering, luring users to a malicious site under the guise of educational 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.cc/pify?keyword=arithmetic+progression+word+problems+with+solutions+pdf
    • http://files.cilldarasouthboard.com/uploads/1/3/2/3/132302944/fofumati.pdf
    • http://files.cavershamholistics.co.uk/uploads/1/3/1/0/131070774/labifenejoseravajij.pdf
    • http://files.kelleysbluegrassdanes.com/uploads/1/3/1/3/131398144/kimumapep-jedomijatiwuwed-kulifodas-xuxubumi.pdf
    • http://files.1-800-99search.com/uploads/1/3/0/9/130969370/sutazazepidug.pdf
    • https://cdn.shopify.com/s/files/1/0431/3602/4742/files/nuwisa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5417/8216/files/41077952425.pdf
    • https://cdn.shopify.com/s/files/1/0432/8770/7804/files/62911945420.pdf
    • https://cdn.shopify.com/s/files/1/0432/9557/2126/files/91194018228.pdf
    • https://cdn.shopify.com/s/files/1/0431/0509/1745/files/gebifoburobuj.pdf
    • https://cdn.shopify.com/s/files/1/0439/3123/8555/files/zopimidoru.pdf
    • https://cdn.shopify.com/s/files/1/0427/5005/0460/files/33243902999.pdf
    • https://cdn.shopify.com/s/files/1/0430/9309/8660/files/vafenipawibutijezo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3847/4397/files/85988197667.pdf
    • https://cdn.shopify.com/s/files/1/0428/7063/6710/files/33373477664.pdf
    • https://cdn.shopify.com/s/files/1/0429/1896/9507/files/75349306862.pdf
    • https://cdn.shopify.com/s/files/1/0433/3617/1679/files/doxes.pdf
    • https://cdn.shopify.com/s/files/1/0430/6881/7562/files/nesimekakiru.pdf
    • https://cdn.shopify.com/s/files/1/0431/7665/7051/files/gawipis.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/
    • https://cdn.shopify.com/s/files/1/0

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007416.bin
7755d9e864274c28f6abb8f369cc68a345f28fcff16720b9e79e20145ef63c81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7416 5460 bytes
font_01_sfnt_off00008694.bin
8f8a83a8e84a1d7262e9959437a7a5b9395ec0300f920220254c927f7cf5b0f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8694 15208 bytes
font_02_sfnt_off0000b61d.bin
3c1c7bd747a9a8f6e1c531457064e9378d9a893e5271ac7381d9d0015290d8f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB61D 16088 bytes

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