Malicious PDF — malware analysis report

Static analysis result for SHA-256 e967a67ace1aec80…

MALICIOUS

PDF

53.5 KB Created: 2020-08-08 22:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11bc3db807d3f63e5e9b2fc2d0d7af90 SHA-1: da1555857b693b176a4ef1cb65429772ac2b4f9a SHA-256: e967a67ace1aec802cb08b26277c3b407e84706b37cc279d0aa5ea4e801a5656
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, it contains a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, but the presence of the malicious redirector URL is a high-confidence indicator of malicious intent.

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=ac+joint+sprain+rehab+protocol+pdf
    • http://files.naturopathgoldcoastqld.com/uploads/1/3/0/7/130774965/vosuleve_wabinesovisapas_wumorez_kuwitonom.pdf
    • http://files.lambertparalegalservices.com/uploads/1/3/1/1/131164557/mifimegoredu_pifeg.pdf
    • http://files.svea1988.com/uploads/1/3/0/8/130874379/garumamezup.pdf
    • http://files.theudlproject.com/uploads/1/3/1/8/131856306/c98a248e177c.pdf
    • http://files.theflourishsisterhood.com/uploads/1/3/1/3/131398156/95d18288fa830.pdf
    • https://cdn.shopify.com/s/files/1/0430/4135/7973/files/12249720073.pdf
    • https://cdn.shopify.com/s/files/1/0434/7248/6566/files/pememidabozam.pdf
    • https://cdn.shopify.com/s/files/1/0434/0131/4454/files/vesugokuboxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8873/1543/files/permission_denied_dir_s_mkdir_usr_local_frameworks.pdf
    • https://cdn.shopify.com/s/files/1/0431/0633/6925/files/47571710730.pdf
    • https://cdn.shopify.com/s/files/1/0432/3124/8539/files/40795717226.pdf
    • https://cdn.shopify.com/s/files/1/0432/3645/8654/files/7953571665.pdf
    • https://cdn.shopify.com/s/files/1/0429/5242/5631/files/vizirajej.pdf
    • https://cdn.shopify.com/s/files/1/0432/6899/7284/files/wibofuda.pdf
    • https://cdn.shopify.com/s/files/1/0430/9745/6801/files/fevupevabupesogiseto.pdf
    • https://cdn.shopify.com/s/files/1/0428/0342/9535/files/jenibotok.pdf
    • https://cdn.shopify.com/s/files/1/0431/8003/2160/files/47426104956.pdf
    • https://cdn.shopify.com/s/files/1/0431/3504/1702/files/canciones_pop_para_guitarra.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_off0000924c.bin
25900b830cf16d2678489f20ad288255a5f3e54bd5e52a13a043327004798f2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x924C 5448 bytes
font_01_sfnt_off0000a4ce.bin
1b08628e5e6231f143837e4621ed58f1faab3f869db282111fb726fb0d1f33dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4CE 10652 bytes

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