Malicious PDF — malware analysis report

Static analysis result for SHA-256 48a486977fde5a96…

MALICIOUS

PDF

35.9 KB Created: 2020-08-12 23:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e00674aed5cd53fb6d86f4c920af5833 SHA-1: ee233c8ccfb8fcdecdd98d60a0b2e5f01510cc4d SHA-256: 48a486977fde5a96e233fce26404a020eab92f2d3eecc7ed7a71be632ae55ed5
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a campus map, which is a common lure for phishing or malware delivery. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the ML classifier strongly supports the malicious nature of the document. The document body itself is heavily obfuscated but contains the malicious URL, indicating an attempt to lead the user to a compromised site.

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.ru/pify?keyword=arizona+state+university+campus+map+pdf
    • http://bimopo.nubiangoatskentucky.com/uploads/1/3/2/7/132710507/9241330.pdf
    • http://wabubiguz.ro.megaplot.org/uploads/1/3/1/4/131453870/wipegosojiwevig.pdf
    • http://files.kiliriseadventures.com/uploads/1/3/1/3/131383580/rugixin.pdf
    • http://files.idslsuppliesltd.com/uploads/1/3/2/7/132712119/sirojijozuv_kilituromutep_bewiveroju.pdf
    • http://files.mainetourismtravel.com/uploads/1/3/0/9/130969939/rowologu-jovonasaliz.pdf
    • https://cdn.shopify.com/s/files/1/0432/3082/2555/files/97831267849.pdf
    • https://cdn.shopify.com/s/files/1/0433/9243/4339/files/academic_performance_of_working_students.pdf
    • https://cdn.shopify.com/s/files/1/0439/2275/1643/files/46180205962.pdf
    • https://cdn.shopify.com/s/files/1/0430/4899/2930/files/fourier_analysis_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/0440/3613/files/aromaticity_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/3149/4810/files/23149897813.pdf
    • https://cdn.shopify.com/s/files/1/0430/9224/6685/files/78008301133.pdf
    • https://cdn.shopify.com/s/files/1/0432/6634/3072/files/puzoxezivu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45598155969.pdf
    • https://cdn.shopify.com/s/files/1/0435/2458/7679/files/68215725266.pdf
    • https://cdn.shopify.com/s/files/1/0429/0487/9271/files/41706156432.pdf
    • https://cdn.shopify.com/s/files/1/0436/1895/9523/files/23971769587.pdf
    • https://cdn.shopify.com/s/files/1/0429/6006/0567/files/210599405.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mufuma.pdf
    • https://cdn.shopify.com/s/files/1/0431/2888/1313/files/gugoverozeminigamot.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_off00004eaf.bin
93482b50e6f22c6452a117459e2e458534920dd166e7ddb20553e76e608c20a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EAF 5468 bytes
font_01_sfnt_off00006144.bin
5c3f1369f9bd744d0810577c7fc8aa9f9562a50dd255ab976c5bac2454aa19e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6144 9708 bytes

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