Malicious PDF — malware analysis report

Static analysis result for SHA-256 153a400c836a5783…

MALICIOUS

PDF

49.1 KB Created: 2020-09-06 16:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01367c9d75e72854225f5c686e688e38 SHA-1: f51ff131c3ac8d5e18b723b064bbc30f68f15d01 SHA-256: 153a400c836a578336f7aecbd77d640dd9335b3dd2201d0de03787d0efd069f6
174 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a link farm, with numerous embedded URLs. The document body, though heavily obfuscated, contains text related to an application form and the malicious URL, suggesting a lure to a phishing or malware site. The ML classifier also strongly flagged this PDF as malicious.

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.
  • 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.
  • 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/wix?keyword=b.+ed+application+form+date+2019
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_5e3700100bf8468690f178499c8e90fc.pdf
    • https://static.usrfiles.com/ugd/0dd040_51bf416fce49424faaee3e6349790574.pdf
    • https://static.usrfiles.com/ugd/b8c837_d82c4382c9d34b348a97cf3062f917ec.pdf
    • https://static.usrfiles.com/ugd/02beb7_309e5dc3ff7740e0a98d01725891467c.pdf
    • https://static.usrfiles.com/ugd/aef5b7_944dd4776b3e40eabc4f840f4bf2638b.pdf
    • https://static.usrfiles.com/ugd/9d7ad9_2c3c753d67434207a0839426750c15e1.pdf
    • https://static.usrfiles.com/ugd/d31907_6e2ce2d22a5943d28adbd9495c0dd619.pdf
    • https://static.usrfiles.com/ugd/3e5d97_99422d9f28c14d98b534f828472dd306.pdf
    • https://static.usrfiles.com/ugd/2ca09c_0a8dbec4baa6416ab33e26d7e8d95a3e.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f2fac69a3194e92864e903fbfe23559.pdf
    • https://static.usrfiles.com/ugd/b65acf_71854563cd4a4f14869d3a89f4b4a602.pdf
    • https://cdn.shopify.com/s/files/1/0431/2452/3169/files/tuzivosurujaloj.pdf
    • https://cdn.shopify.com/s/files/1/0432/1263/6315/files/98325704142.pdf
    • https://cdn.shopify.com/s/files/1/0437/8217/6920/files/xejubukitela.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/rurajemajodosup.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7884/files/bavoruxanugojigusenaxasa.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000802f.bin
f939a4f09513151bff96b246ace72b570eb4859c951f9c83e56b17e636340df1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x802F 5684 bytes
font_01_sfnt_off00009389.bin
9a73fea2c91503b53aa500cb99acd2af1e919833bb403b360f5fdc1dc8aafdf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9389 10796 bytes

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