Malicious PDF — malware analysis report

Static analysis result for SHA-256 67b939b2dfe0cdf7…

MALICIOUS

PDF

61.7 KB Created: 2020-07-30 01:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3fd173107d3da5fd753fd3dd39d3eeaa SHA-1: a95531ecfe37251c29ba985b97dd285ff03ac409 SHA-256: 67b939b2dfe0cdf7c175cb7681f5175e9a0ed7959b66f974a24b95d69c5ed5d0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely intended to lead the user to a phishing or malware download site. The document body, though heavily obfuscated, contains text related to 'CIA self defense techniques pdf' and the authoring application 'wkhtmltopdf', suggesting a lure. The presence of numerous embedded links further supports the SEO link farm heuristic, indicating an attempt to drive traffic to external sites.

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=cia+self+defense+techniques+pdf
    • http://files.4energia.com/uploads/1/3/0/7/130740521/pepuk_tuneke_xalisanozemad.pdf
    • http://files.karenlever.com/uploads/1/3/0/8/130874031/74df9e.pdf
    • http://files.burkittsvilleruritanclub.org/uploads/1/3/2/8/132815008/vanixidewimeguw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://cdn.shopify.com/s/files/1/0430/8297/3346/files/67598677029.pdf
    • https://cdn.shopify.com/s/files/1/0434/5357/9430/files/96911435503.pdf
    • https://cdn.shopify.com/s/files/1/0434/7576/3353/files/52310660124.pdf
    • https://cdn.shopify.com/s/files/1/0433/4986/8712/files/kozasorodevufikino.pdf
    • https://cdn.shopify.com/s/files/1/0433/1687/1333/files/59568679460.pdf
    • https://cdn.shopify.com/s/files/1/0430/5554/6517/files/53423139606.pdf
    • https://cdn.shopify.com/s/files/1/0435/8881/2959/files/wepabisunabe.pdf
    • https://cdn.shopify.com/s/files/1/0430/9408/1687/files/zufosavemitiri.pdf
    • https://cdn.shopify.com/s/files/1/0429/6451/7023/files/81310740745.pdf
    • https://cdn.shopify.com/s/files/1/0430/8910/0951/files/pejuxemeteferekuxi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/luvibuxunefipefijuli.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off0000cd02.bin
4afed1c87f33907b6deb9f02c49cb9f5920e53b11c23565a6be0aaae153f80a0		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCD02 17376 bytes
font_00_sfnt_off0000783f.bin
89f054fa2d8d357001dae40be07e7c65be53567449da30e315ce556643b318b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x783F 5068 bytes
font_01_sfnt_off00008966.bin
83bd052e129481ffeb624ccc0a26dfdd850ee6790e065303851ad9239b16c36e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8966 9852 bytes
font_02_sfnt_off0000a4ba.bin
0dee4139573eb2b1e1aed45846c3e3a3d7075734cea0867ca45719367fc2e01c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4BA 13092 bytes

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