Malicious PDF — malware analysis report

Static analysis result for SHA-256 5692a34ef160e749…

MALICIOUS

PDF

52.2 KB Created: 2020-08-11 04:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd8ddafc3d33475fd2a400d5cd393910 SHA-1: 3135d5546988a7e276183db72d7bd9af953dd6b6 SHA-256: 5692a34ef160e749696e712e680413b0a799bce7da4f466afca5e559d358a888
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector, while another noted a large PDF link farm. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=naming+organic+compounds+with+functional+groups+practice+pdf', which is also flagged as a malicious redirector. The primary purpose appears to be directing users to potentially harmful external content through a link farm.

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=naming+organic+compounds+with+functional+groups+practice+pdf
    • http://files.carterrod.com/uploads/1/3/1/4/131482931/femekuwizigulu_wopiwaluwujogoj_vazutifukatix.pdf
    • http://files.derrickanthonyking.com/uploads/1/3/2/6/132695408/5869172.pdf
    • http://files.plattevillekiwanisclub.org/uploads/1/3/1/3/131379118/juwagerezidage-pedumizuv-bupavo-rugekuj.pdf
    • http://xebokebop.shortcrazyvietnam.com/uploads/1/3/1/1/131164250/nafenut-gizebaluwefiwa-rumarenadi.pdf
    • http://files.qristara.com/uploads/1/3/1/6/131607407/8480675.pdf
    • https://cdn.shopify.com/s/files/1/0427/7246/3772/files/albinismo_unam.pdf
    • https://cdn.shopify.com/s/files/1/0429/6930/1151/files/96570469467.pdf
    • https://cdn.shopify.com/s/files/1/0433/8358/6977/files/loxegarasifogobezim.pdf
    • https://cdn.shopify.com/s/files/1/0434/0557/4309/files/gubedikerazuduxi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5523/4710/files/lefavatolewem.pdf
    • https://cdn.shopify.com/s/files/1/0437/4809/8209/files/bajafekuvifumovud.pdf
    • https://cdn.shopify.com/s/files/1/0436/9406/3770/files/25694659657.pdf
    • https://cdn.shopify.com/s/files/1/0440/4235/4853/files/74024090539.pdf
    • https://cdn.shopify.com/s/files/1/0450/8745/7432/files/bufirojixijemoperidit.pdf
    • https://cdn.shopify.com/s/files/1/0434/1796/0600/files/90027442335.pdf
    • https://cdn.shopify.com/s/files/1/0431/7449/4369/files/gibunijogabuwemulikogu.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_off00007f5d.bin
0b046adf57d7cde3bb0d51cc9987b4ef55f720bf56bc711cb7678ffcfff35142		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F5D 5512 bytes
font_01_sfnt_off000091ff.bin
f5916e1d04ea3d7d913bb8da855ce02defd0ffea45fad6dc3925666170fea427		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91FF 10188 bytes
font_02_sfnt_off0000b4e3.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E3 4324 bytes

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