Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e71488b6209da79…

MALICIOUS

PDF

35.4 KB Created: 2020-07-10 14:40:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 087fd399844d865afc8229eae31d4080 SHA-1: e54c047a4840235bde4b4c8fa1a2bd052e251f89 SHA-256: 7e71488b6209da7904f9e556d2283bd420a47b75d22b96f8edef6a1c5e6e42df
152 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, identified as a link farm, designed to redirect users to malicious infrastructure. Specifically, the primary link leads to `https://ttraff.cc/pify?keyword=ikea+poang+chair+instructions+pdf`, which is flagged as a malicious redirector. The document body, though partially corrupted, also contains this URL and other links to PDF files hosted on various domains, suggesting a broad distribution or SEO poisoning tactic. The ML classifier strongly supports the malicious nature of this PDF.

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=ikea+poang+chair+instructions+pdf
    • http://files.heartfullartstudio.com/uploads/1/3/1/4/131437475/mobaj.pdf
    • http://files.snowypeaksoap.com/uploads/1/3/2/3/132302973/a7512c13cdce8e.pdf
    • http://files.tattookelowna.ca/uploads/1/3/2/7/132741020/poxiroxogarelog.pdf
    • http://files.jeaneart.com/uploads/1/3/0/9/130969879/3b2e74c4.pdf
    • http://files.amausainc.com/uploads/1/3/1/3/131382141/2571550.pdf
    • http://files.fengshuicollective.com/uploads/1/3/0/9/130969473/0c9691fd8cf2a.pdf
    • http://files.atowncenter.org/uploads/1/3/2/7/132740639/1165e.pdf
    • http://files.yuukan.com.au/uploads/1/3/0/7/130739322/bd550df9039fe2.pdf
    • http://files.tru-endeavors.com/uploads/1/3/1/4/131407086/luporusupi-mopodinazuzezu.pdf
    • http://files.rensbigportal.net/uploads/1/3/1/4/131438427/84d5794.pdf
    • http://files.fountdallas.com/uploads/1/3/1/4/131406379/a894a8ea.pdf
    • https://suvirowom.files.wordpress.com/2020/06/zumowuwatonedatan.pdf
    • https://wuxewaxijij.files.wordpress.com/2020/06/bixanibekajetojujos.pdf
    • https://lezufapemuz.files.wordpress.com/2020/07/40157691832.pdf
    • https://weberex.files.wordpress.com/2020/06/zelomokawuvoxizufir.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5600/files/75847198374.pdf
    • https://cdn.shopify.com/s/files/1/0432/6152/6166/files/33701885557.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28650507632.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/68905528383.pdf
    • https://cdn.shopify.com/s/files/1/0431/8114/6280/files/gonepurikobetag.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xakisone.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pigirerunozekolufis.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_off00004e13.bin
3bb90b7ae87f068e90560b47fbcb304a76913e96f294a9acd18e2a87c5bae54a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E13 5268 bytes
font_01_sfnt_off00005fef.bin
c91cbddd76d13b8472bbf18282a896c3e38d4449c5a236ef08e3272137c1b3bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FEF 9580 bytes

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