Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a531fcb0ef1755…

MALICIOUS

PDF

55.7 KB Created: 2020-08-06 18:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17aee3ade4b46f44e3f0b4433f2b50f3 SHA-1: 57dbbebdaf37921aa21595a685ffc93217744367 SHA-256: 65a531fcb0ef1755663669e36379e028cf0d36be9d6509aa148882c1850b07dc
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, includes the target URL, suggesting an attempt to lure users to malicious content. The presence of a large number of external PDF links further indicates a link farm or SEO manipulation tactic. No scripts were extracted, but the embedded links are sufficient to classify this as a malicious redirector.

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.com/wb?keyword=working%20of%20vortex%20tube%20refrigeration%20pdf
    • http://files.bridecon.com/uploads/1/3/0/9/130969923/sutikumunoxonem_jizuzomasoja_lavifegew.pdf
    • http://netuf.sethharrislaw.com/uploads/1/3/2/7/132712323/2d5eb54.pdf
    • http://files.spirithorsetrc.org/uploads/1/3/0/7/130738805/tolabizi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/1149/7366/files/muzosurazan.pdf
    • https://cdn.shopify.com/s/files/1/0443/8661/5462/files/gns_3_ios_images.pdf
    • https://cdn.shopify.com/s/files/1/0432/1925/5456/files/sobani.pdf
    • https://cdn.shopify.com/s/files/1/0427/4018/7303/files/2186465392.pdf
    • https://cdn.shopify.com/s/files/1/0433/1565/8920/files/24374925844.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56325204281.pdf
    • https://cdn.shopify.com/s/files/1/0439/0790/7752/files/fred_boat_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/5774/9917/files/mafuwanalituve.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bamizubonofosexewa.pdf
    • https://cdn.shopify.com/s/files/1/0432/4245/5197/files/3352637892.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/jukiwisazadem.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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008770.bin
48f8719297a34b22ba75da94b3129757c8c048f5cb8bec207e5309ee9d2de204		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8770 5344 bytes
font_01_sfnt_off000099cb.bin
02ce503db8fd04558311c7b49154b793806e5720338f29f63129404788a4bb6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99CB 10148 bytes
font_02_sfnt_off0000bcd5.bin
713933360072c9d59346590fad668f98c3603c6d2b72ed941ce85481f6af0b74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD5 16060 bytes

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