Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3db92619f5a0da2…

MALICIOUS

PDF

42.3 KB Created: 2020-08-06 22:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e27413066e1633a671960b9642ad7de9 SHA-1: f5281eba8682bebc260003c5fe634c927d679f62 SHA-256: c3db92619f5a0da2e1ef10f461ab7a52b994dbdcbfce1fa12bce01e9fc593796
154 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 'https://ttraff.com/pify?keyword=cardiac+tamponade+pdf+2020'. Additionally, it features a PDF link farm heuristic, indicating a large number of external links, with the first being 'https://cdn.shopify.com/s/files/1/0428/8679/1334/files/rokexizikafojopivogol.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body contains the malicious URL, suggesting a social engineering lure.

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=cardiac+tamponade+pdf+2020
    • http://files.beadedtreats.com/uploads/1/3/0/8/130813841/8043cbaa20d6f56.pdf
    • http://files.sdp.scot/uploads/1/3/0/8/130873833/sinib_sovifigax.pdf
    • http://files.ronleachsoapstone.com/uploads/1/3/0/7/130740048/nalabejolawi.pdf
    • http://files.alidub.com/uploads/1/3/0/7/130775953/mavisokitetipela.pdf
    • http://files.sara-rodrigues.com/uploads/1/3/1/3/131398498/saranibelobu-zawibejiridozix.pdf
    • https://cdn.shopify.com/s/files/1/0428/8679/1334/files/rokexizikafojopivogol.pdf
    • https://cdn.shopify.com/s/files/1/0433/9892/2403/files/38553812905.pdf
    • https://cdn.shopify.com/s/files/1/0437/3463/0554/files/32658144815.pdf
    • https://cdn.shopify.com/s/files/1/0429/5357/2515/files/muwajotisoselasud.pdf
    • https://cdn.shopify.com/s/files/1/0429/3971/1655/files/29412633578.pdf
    • https://cdn.shopify.com/s/files/1/0432/3373/8911/files/stewart_calculus_concepts_and_contexts.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mozesuseb.pdf
    • https://cdn.shopify.com/s/files/1/0440/3943/8486/files/opencv_install_ubuntu.pdf
    • https://cdn.shopify.com/s/files/1/0436/1905/7826/files/dekej.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4204/files/rubitegejekeminanifolit.pdf
    • https://cdn.shopify.com/s/files/1/0433/4521/5656/files/54269375313.pdf
    • https://cdn.shopify.com/s/files/1/0432/6467/1909/files/99234334240.pdf
    • https://cdn.shopify.com/s/files/1/0430/3755/6889/files/mominigasarufusujiwef.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_off000066fb.bin
4edbfca2c43781793c5ccc6a4af0db7f936eda0e0f59e8effefc7987d090e5a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66FB 5272 bytes
font_01_sfnt_off000078d4.bin
17dd83b1ff03027d7a67ab244b2c1645bde47ed52b3c9d0d6a7132e4b566a93e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78D4 10316 bytes

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