Malicious PDF — malware analysis report

Static analysis result for SHA-256 68f350313ee99160…

MALICIOUS

PDF

53.2 KB Created: 2020-09-04 12:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f40e9c49bc70ccaceed36d19f372bd45 SHA-1: 1649fa84f63fd5ee951ede038ec50a70ce25d33b SHA-256: 68f350313ee99160fe315b416f95f5e0167fd7d3c50e681029542309ebfe5f22
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.club, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains the same URL and appears to be a lure for users searching for information on Android keyboards. The presence of numerous external PDF links, many pointing to benign Shopify URLs, suggests a link farm or SEO manipulation tactic to improve the ranking of the malicious redirector. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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.club/wix?keyword=alternative+keyboard+for+android
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/2531/6514/files/pazemasuvavesib.pdf
    • https://cdn.shopify.com/s/files/1/0431/2498/1921/files/nebebuwup.pdf
    • https://cdn.shopify.com/s/files/1/0440/6640/6552/files/i_love_you_in_french_formal.pdf
    • https://cdn.shopify.com/s/files/1/0435/9893/8274/files/batewipenewizu.pdf
    • https://cdn.shopify.com/s/files/1/0437/9944/5664/files/python_round_float.pdf
    • https://cdn.shopify.com/s/files/1/0431/1184/1958/files/sodenadabam.pdf
    • https://cdn.shopify.com/s/files/1/0437/6988/8917/files/20767933064.pdf
    • https://cdn.shopify.com/s/files/1/0433/4390/4927/files/bon_restaurant_amiens_guide_du_routard.pdf
    • https://cdn.shopify.com/s/files/1/0437/3977/5128/files/16483761860.pdf
    • https://static.usrfiles.com/ugd/8ac1ab_c3b059fc24bd4eb0a201c28f5e215f18.pdf
    • https://static.usrfiles.com/ugd/314c35_afea3b0fb94d43a3923c63ad8b9e810b.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • 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_off00006cd7.bin
3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD7 6440 bytes
font_01_sfnt_off00007ccb.bin
2ff71f583a8144cf4828c8b7625439b1454e6f5e376f3f628a6a727047b12985		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CCB 5076 bytes
font_02_sfnt_off00008e2f.bin
dfed45e3962b8f5cf4d29575ac3c06ceb3db9100f112e45b99fb279a2e1ca1ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E2F 10520 bytes
font_03_sfnt_off0000b239.bin
0216150ac0e5ade23b072752459620ec704bdac01526bfbadd96d51f96873ef3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB239 16168 bytes

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