Malicious PDF — malware analysis report

Static analysis result for SHA-256 6edacd210a5b0304…

MALICIOUS

PDF

62.5 KB Created: 2020-08-21 03:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 680a695876fe6199a3f07a9cba8745e6 SHA-1: 5ac6a9cf238142aaddefe705a6a4bab68e05855f SHA-256: 6edacd210a5b0304a59d16dbac997bb0ecf93d108233935497852744266b1589
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to external PDF files hosted on various domains, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is used to obscure the final destination. The document body, though partially corrupted, contains text related to an 'answer key' and includes the malicious URL, indicating a lure to trick users into clicking the link. No scripts were extracted, but the presence of malicious redirectors and a large number of external links strongly suggests a malicious intent to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=bsf+constable+tradesman+answer+key+2018
    • http://files.juddbristo.com/uploads/1/3/1/3/131379246/piduj_dibusuxusigeni_rodukepuxusov_bevafi.pdf
    • http://files.thisweeksbestdeals.com/uploads/1/3/1/3/131381109/vugemafuxamidus.pdf
    • http://bidib.blogwithbrit.com/uploads/1/3/1/6/131637016/zapiporolodobe.pdf
    • http://files.cleanteam-wc.com/uploads/1/3/1/3/131384638/2775539.pdf
    • http://files.sunsethouseandgardens.com/uploads/1/3/1/1/131164063/beroxuw-wusamelizabu-lutinelexuted.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0440/7659/7400/files/53280348216.pdf
    • https://cdn.shopify.com/s/files/1/0439/6823/3630/files/vobukeni.pdf
    • https://cdn.shopify.com/s/files/1/0440/9910/9016/files/electronics_workbench.pdf
    • https://cdn.shopify.com/s/files/1/0430/2408/9242/files/bavixapurogef.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96672573922.pdf
    • https://cdn.shopify.com/s/files/1/0427/8091/7926/files/70188788718.pdf
    • https://cdn.shopify.com/s/files/1/0431/6404/1373/files/38357864584.pdf
    • https://cdn.shopify.com/s/files/1/0440/6149/1352/files/kenmore_power_miser_9.pdf
    • https://cdn.shopify.com/s/files/1/0430/8323/5489/files/42824267767.pdf
    • https://cdn.shopify.com/s/files/1/0435/3346/7807/files/cbse_class_11_physical_education_syllabus_pdf.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_off000089cc.bin
6df183839e171cb129a83c68502900d5780f45e750eff6ef47475bbf430465f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89CC 6136 bytes
font_01_sfnt_off00009eaa.bin
acae4ea2b20538b4e58366f2cb8a741d2e39bf6bb61d760d8a088b60e8624351		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EAA 10776 bytes
font_02_sfnt_off0000c394.bin
2fa4f296fe9e38b1bea2264e65e06c45fbbf4edfcb32b68fd436b1108ab95b01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC394 16096 bytes
font_03_sfnt_off0000d897.bin
285eaea1eea8f49adb1e556cd608b9af940f3f5663b7203ac80cfeffb1b93463		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD897 5296 bytes

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