Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c9bcb284a59362…

MALICIOUS

PDF

41.4 KB Created: 2020-08-08 18:56:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b5271d950013c4a0a68c1d9f1490cb5 SHA-1: 860d6a3518ef7a8809d870c256923186f4bb1c15 SHA-256: b7c9bcb284a59362c105159dffbbbfbf159bb17810787784eca620e77ecfe9d9
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, identified as a PDF link farm. One of these links, 'https://ttraff.cc/pify?keyword=budget+worksheet+pdf', points to a known malicious redirector. The document body, though heavily obfuscated, contains references to 'budget worksheet pdf' and the wkhtmltopdf tool, suggesting a lure to disguise the malicious intent. The primary attack pattern involves redirecting users to malicious infrastructure through a deceptive document.

Heuristics 3

  • 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.
  • 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=budget+worksheet+pdf
    • http://files.xaletpigall.com/uploads/1/3/0/7/130738739/de06ac46ab180.pdf
    • http://files.downingtownswimacademy.com/uploads/1/3/1/4/131453219/b58539fa67b0289.pdf
    • http://files.turnsofphrase.com/uploads/1/3/1/4/131410009/noxugifivasuxakazob.pdf
    • http://files.liranzofit.com/uploads/1/3/0/7/130776401/fomavesemu_waduxile_juvifigot_xifiritunodeted.pdf
    • https://cdn.shopify.com/s/files/1/0430/9660/4825/files/rujozirebovokutunajuba.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vabagibad.pdf
    • https://cdn.shopify.com/s/files/1/0438/9522/6523/files/68291661757.pdf
    • https://cdn.shopify.com/s/files/1/0434/2149/9548/files/vabujubuteranuse.pdf
    • https://cdn.shopify.com/s/files/1/0434/7111/0308/files/58400235093.pdf
    • https://cdn.shopify.com/s/files/1/0433/0792/5654/files/23933249622.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29121996303.pdf
    • https://cdn.shopify.com/s/files/1/0435/4146/3189/files/tisezivi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1480/files/83575633734.pdf
    • https://cdn.shopify.com/s/files/1/0431/6758/0322/files/70338436261.pdf
    • https://cdn.shopify.com/s/files/1/0428/5769/3347/files/35532522783.pdf
    • https://cdn.shopify.com/s/files/1/0432/7335/5424/files/36831297198.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_off000063f5.bin
e7c95221564e35d23a01657d97984f94c810615601650049ec58dbf7f03e521b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63F5 5264 bytes
font_01_sfnt_off000075f8.bin
ac51bd59eaf1bd6f90c74804cc6398ab950c7da741b9910404a73dacf1f1e8b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75F8 10276 bytes

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