Malicious PDF — malware analysis report

Static analysis result for SHA-256 839d5212e768fc73…

MALICIOUS

PDF

49.7 KB Created: 2020-09-01 03:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39ad9dc0c8d590e21a67f197ea2d540f SHA-1: dc425e3b5a012540580610d0ba4f2db6df957f05 SHA-256: 839d5212e768fc73c6bec542e852a638572cc2c444126519410800e2ba338e61
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on Shopify and appear to be part of a link farm. One prominent link directs to 'ttraff.cc', a known malicious redirector, and is presented with a lure to download 'Aloha browser for windows free'. This suggests a social engineering tactic to trick users into downloading potentially malicious software or visiting further compromised sites. No scripts were extracted, but the presence of numerous external links and a malicious redirector indicates a high likelihood of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/wix?keyword=aloha+browser+for+windows+free
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7208/6435/files/epson_workforce_wf-_2650_driver.pdf
    • https://cdn.shopify.com/s/files/1/0437/3708/8154/files/cessna_caravan_208b_training_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/3139/6501/files/lolevotigupedemiban.pdf
    • https://cdn.shopify.com/s/files/1/0440/0037/9038/files/616662623.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13977390730.pdf
    • https://static.usrfiles.com/ugd/cc03df_83b457d8299347998bbae50c272134ab.pdf
    • https://static.usrfiles.com/ugd/4117a9_b2fbd3016c3d44c5953ddafebd563f05.pdf
    • https://static.usrfiles.com/ugd/de3d83_c40809ca068d4d87a8a8a69a14060906.pdf
    • https://static.usrfiles.com/ugd/3e9e83_fb565b4fa0dd4b30952c9633207dc977.pdf
    • https://static.usrfiles.com/ugd/e5a943_b67b15209f814d9b81225e4c994af6aa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/hadisa_afaan_oromoo.pdf
    • https://cdn.shopify.com/s/files/1/0438/6376/9243/files/agribusiness_management.pdf
    • https://cdn.shopify.com/s/files/1/0461/1692/9700/files/mage_the_awakening_second_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/0706/5757/files/ecostruxure_augmented_operator_advisor.pdf
    • https://cdn.shopify.com/s/files/1/0428/1165/4307/files/zavab.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006636.bin
1af06022405d946db4f6157ce6b65cef790abe1c704c0778428a9df2b551666f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6636 5216 bytes
font_01_sfnt_off000077f0.bin
921b17cebf27161a3a6130e27837bef85d37792b87f1bb497a8066080b67046e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77F0 2052 bytes
font_02_sfnt_off000080a6.bin
f1accb39eeb612620b4368b99fc57ccfd2c50b1e7094e98666e36c98fe57bc64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80A6 10120 bytes
font_03_sfnt_off0000a38d.bin
f267a97a42ed964490c0c36cf8d24d30f5cfc386ee24850e75bb3a4991f11828		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA38D 16376 bytes

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