Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e4b9ed7215d32b8…

MALICIOUS

PDF

56.8 KB Created: 2020-07-21 00:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d5eaa1ab41315eb942bcc0ae6270fd9 SHA-1: 5b01bda333f6eacde057b3a722ad86cd098badb1 SHA-256: 4e4b9ed7215d32b8eb4d39f8692563a2631a36e9cb6a609f6a1d6cf2fa5bf73d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains embedded links that redirect to malicious infrastructure, specifically a URL associated with a redirector. The document body, though heavily obfuscated, appears to be a lure related to software downloads. The presence of numerous external links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to attract victims. 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.ru/wb?keyword=pdf%20xchange%20viewer%2064%20bit%20pl
    • http://files.bluevalemusic.com/uploads/1/3/2/3/132302960/tukovopanul.pdf
    • http://files.whitestole.com/uploads/1/3/0/7/130739456/lagepumujajene-gered-padapimaj-bubow.pdf
    • http://files.briannaholt.com/uploads/1/3/1/3/131384583/jotelinitegexe.pdf
    • https://cdn.shopify.com/s/files/1/0430/6986/6141/files/surevopavalasenuxisevizi.pdf
    • https://cdn.shopify.com/s/files/1/0429/1536/5031/files/1100067741.pdf
    • https://cdn.shopify.com/s/files/1/0436/0264/1059/files/36735364275.pdf
    • https://nutumomox.files.wordpress.com/2020/06/xegelolarisiwebumoter.pdf
    • https://segokowiw.files.wordpress.com/2020/06/49373850780.pdf
    • https://pixojixose.files.wordpress.com/2020/06/paxakijinizuwozikoz.pdf
    • https://rawuduged.files.wordpress.com/2020/07/48854049125.pdf
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/51086421001.pdf
    • https://cdn.shopify.com/s/files/1/0433/5285/0586/files/jasogabonenabasiz.pdf
    • https://cdn.shopify.com/s/files/1/0438/0416/4257/files/81965122197.pdf
    • https://cdn.shopify.com/s/files/1/0430/0763/9711/files/jozufifutomesebupi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3957/2643/files/dumofefokap.pdf
    • https://cdn.shopify.com/s/files/1/0434/6337/7048/files/24013837996.pdf
    • https://cdn.shopify.com/s/files/1/0430/5027/0869/files/2437095551.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/larabobed.pdf
    • https://cdn.shopify.com/s/files/1/0433/1955/8299/files/telofepubigukupefurufi.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/
    • https://nutumomox.files.wordpress.com/2020/06/xegelolarisiwebumoter

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009a2a.bin
d816abc38e8a36f7e10de88b94c2652b6d5b9ea242d7c69a1a6c29bd3a9fb0af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A2A 5520 bytes
font_01_sfnt_off0000acf1.bin
6f8b5c6beb9333993e425c1564d34bfb2a5d8570dfc8bfd86aa6bce4bc0951ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACF1 12848 bytes

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