Malicious PDF — malware analysis report

Static analysis result for SHA-256 896920aafd5d71ff…

MALICIOUS

PDF

35.0 KB Created: 2020-08-10 10:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8b2ae384644b0fcde66016c89c0ca21 SHA-1: e91597edfb2044d52b13863d165f7d65d48e47ad SHA-256: 896920aafd5d71ff590bbff3a7a2073ebb4edbe7618bf313d6027a37cf9ae05a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a large number of embedded links, many pointing to shopify.com, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for sheet music, likely to trick users into downloading further malware. The ML classifier strongly indicated 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=oblivion+sheet+music+pdf+violin
    • http://files.soundcityreading.net/uploads/1/3/2/6/132696113/86cab.pdf
    • http://files.bennabinger.com/uploads/1/3/2/8/132815882/jukowodanesopid-subomexino-zimap-vazepuwajutodi.pdf
    • http://files.dhopusc.org/uploads/1/3/0/8/130874104/gorefebokilamirag.pdf
    • http://files.livheym.com/uploads/1/3/2/7/132740805/kasidazi-mojolekidu-somedo-topewapuni.pdf
    • http://files.bluenosewoodworks.com/uploads/1/3/2/8/132815961/somokirolurujewikusi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8085/1364/files/3347464437.pdf
    • https://cdn.shopify.com/s/files/1/0429/8869/9802/files/kevogubumojiwul.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3288/files/angiofibroma_nasofaring_juvenile_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0435/2638/9912/files/wizireza.pdf
    • https://cdn.shopify.com/s/files/1/0437/8080/0674/files/xojodubodem.pdf
    • https://cdn.shopify.com/s/files/1/0431/6495/8879/files/39279318229.pdf
    • https://cdn.shopify.com/s/files/1/0431/7600/1704/files/free_loft_bed_plans.pdf
    • https://cdn.shopify.com/s/files/1/0434/3382/0322/files/gajapavekenur.pdf
    • https://cdn.shopify.com/s/files/1/0436/1568/2717/files/marshall_rosenberg_nonviolent_communication.pdf
    • https://cdn.shopify.com/s/files/1/0434/9794/7300/files/sufor.pdf
    • https://cdn.shopify.com/s/files/1/0430/3749/1354/files/surotukorekadoxeviwojupi.pdf
    • https://cdn.shopify.com/s/files/1/0437/8145/6023/files/wolamumuzasugawuxafux.pdf
    • https://cdn.shopify.com/s/files/1/0430/7828/7521/files/livojeti.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/77330784460.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_off00004c52.bin
9a6cbedcfe103e5a133c0b0904898adeb60ff36e3a12543313dc8eccb7de0528		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C52 5316 bytes
font_01_sfnt_off00005e49.bin
23b551ad1b4d9069238f503c5e080d014166070c1c42a1ab9545e97a354d19aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E49 9548 bytes

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