Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ff6c3a20680456…

MALICIOUS

PDF

44.2 KB Created: 2020-07-31 21:40:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec499b566aaa307c522a1c88aa717b0e SHA-1: 71342aa108bf9db69068490685aadee5f1af3950 SHA-256: c3ff6c3a2068045669c8d8f6a9c5f5a9c368dcb3613f548ee828626dd702941e
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, contains text related to calculus solutions and the malicious URL, suggesting a lure to trick users into clicking the link. The PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics confirm the malicious nature of the embedded links. No scripts were extracted from this sample.

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=single+variable+calculus+solutions+manual+pdf
    • http://files.capitalexpenditures.net/uploads/1/3/1/4/131437699/fajuduxudani-tapenor-nifid.pdf
    • http://files.sjpscitech.org/uploads/1/3/0/8/130813906/kefatofe-foriwipilafab-mimonutosu-mepononanol.pdf
    • http://files.ellenalt.com/uploads/1/3/2/8/132814136/kukazaduxifafe.pdf
    • http://files.blackicepress.com/uploads/1/3/0/8/130874086/lafidukowanas.pdf
    • https://cdn.shopify.com/s/files/1/0428/5952/8355/files/pilododusejugibixabu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7161/8723/files/50019973445.pdf
    • https://cdn.shopify.com/s/files/1/0429/8991/2218/files/zibedirarafenuvutozis.pdf
    • https://cdn.shopify.com/s/files/1/0436/1984/4258/files/33455157499.pdf
    • https://cdn.shopify.com/s/files/1/0438/7612/2792/files/ledevigepiki.pdf
    • https://cdn.shopify.com/s/files/1/0430/1930/5113/files/guwojobizusudu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8039/files/toruruvopawutubuj.pdf
    • https://cdn.shopify.com/s/files/1/0431/8419/3696/files/pusoraponujaz.pdf
    • https://cdn.shopify.com/s/files/1/0429/5586/6263/files/23168690496.pdf
    • https://cdn.shopify.com/s/files/1/0433/4501/9045/files/zokijek.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/63515052242.pdf
    • https://cdn.shopify.com/s/files/1/0428/1679/8883/files/riganobibi.pdf
    • https://cdn.shopify.com/s/files/1/0440/4409/1557/files/mikaso.pdf
    • https://cdn.shopify.com/s/files/1/0430/1992/7713/files/xakozen.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fab.bin
5a929bfc4790d696d04c792c49a5cfb1b41662fd233d9f154934d43c2308926a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAB 5660 bytes
font_01_sfnt_off000072cd.bin
235f7c5be42857db76024df5d2d3cc67f18c59e59484191f50f622806b7afaaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72CD 10144 bytes
font_02_sfnt_off0000957c.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x957C 4324 bytes

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