Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2130382bb84aef…

MALICIOUS

PDF

56.7 KB Created: 2020-08-08 19:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ecaace9dc10339309d52323dd75d3d8 SHA-1: 7facde24efe86076c8c284b37c59e53493e349ac SHA-256: 8f2130382bb84aef2c9578db536d0dbe86fa322f15184b135e9688cf08ece5ab
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, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=south+african+food+based+dietary+guidelines+pdf', is designed to redirect users to malicious content. The PDF also exhibits characteristics of a link farm, suggesting an attempt to manipulate search engine results or distribute links broadly. The ML classifier strongly indicates maliciousness.

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=south+african+food+based+dietary+guidelines+pdf
    • http://files.birthingintentionally.com/uploads/1/3/1/4/131483153/rufodezize.pdf
    • http://files.deadliftcoffee.com/uploads/1/3/2/8/132814302/6679080.pdf
    • http://files.bjinteriorarchitect.com/uploads/1/3/0/7/130775033/a4fc093b.pdf
    • http://files.venturapaintparties.com/uploads/1/3/2/6/132681823/2963552.pdf
    • http://files.lyndhurstarttrail.com/uploads/1/3/0/7/130739265/07c0e3b3e3ec10c.pdf
    • https://cdn.shopify.com/s/files/1/0437/2443/9704/files/5102320596.pdf
    • https://cdn.shopify.com/s/files/1/0433/4062/8120/files/49656179484.pdf
    • https://cdn.shopify.com/s/files/1/0438/4954/7936/files/tegobasaliributenonokin.pdf
    • https://cdn.shopify.com/s/files/1/0450/0927/2990/files/the_haunting_of_hill_house_pilot_script.pdf
    • https://cdn.shopify.com/s/files/1/0433/2866/7798/files/zofetakokuvopijelugo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6269/files/29304146121.pdf
    • https://cdn.shopify.com/s/files/1/0429/9830/0823/files/lowes_mount_pleasant_tx.pdf
    • https://cdn.shopify.com/s/files/1/0431/7016/8986/files/91318935417.pdf
    • https://cdn.shopify.com/s/files/1/0435/4880/3227/files/tejadoforukowolenogopaz.pdf
    • https://cdn.shopify.com/s/files/1/0436/9340/8409/files/minecraft_sharpness_enchantment.pdf
    • https://cdn.shopify.com/s/files/1/0430/9647/3749/files/20524926537.pdf
    • https://cdn.shopify.com/s/files/1/0435/0096/1947/files/85440278718.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/32506959796.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_off00009d3a.bin
aa3671cf01d9eca599ff2da49f18ff078d4c2d455a6575df2a194fdf632142e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D3A 5764 bytes
font_01_sfnt_off0000b0d4.bin
60af1e2f2c7e404a3d5724560f2c828a5efad07ce1afcc33362a5a23b2c01a4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D4 10504 bytes

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