Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a5a785f69e4d9f6…

MALICIOUS

PDF

43.4 KB Created: 2020-09-02 08:40:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8ca6019b30dacb54d9a34390ec5577a SHA-1: a323ba4b672d8fbae924a5075c8fcc729c2848b7 SHA-256: 4a5a785f69e4d9f634a47cba864d49ecb6cd27c0027b622d2df56d6af5507b10
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=credit+card+machine+remote++failed'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to drive traffic to the malicious redirector. No scripts were extracted, but the embedded URL and the PDF structure strongly suggest a phishing or redirection attack.

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.cc/wix?keyword=credit+card+machine+remote++failed
    • https://cdn.shopify.com/s/files/1/0437/6471/1575/files/97376653320.pdf
    • https://cdn.shopify.com/s/files/1/0432/2010/7428/files/simple_autobiography_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/4324/8545/files/22538444361.pdf
    • https://static.usrfiles.com/ugd/d63aaf_64101fbf38ec47079ebeeaef85420940.pdf
    • https://static.usrfiles.com/ugd/1cfe37_5cc63ed294b943468e61f0c9cecc41f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_bca60d34ebaf4d7b82910ce054db4c36.pdf
    • https://static.usrfiles.com/ugd/c1108c_c48ba9090c3e48aab160fb5826bcc403.pdf
    • https://static.usrfiles.com/ugd/5438e3_8340d8bc061a4b318ee1d240eac64ef3.pdf
    • https://static.usrfiles.com/ugd/974a4e_17118cfe8ecc4a16b6514eb767fba46b.pdf
    • https://static.usrfiles.com/ugd/b8c837_85f6f5ce8cc248e7a4413e0384b2d39e.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c7f8045d3244e7bbbeaa3b1f5973342.pdf
    • https://static.usrfiles.com/ugd/a838c0_29d3152a1c284c4cbbe9b7cc6942f3bd.pdf
    • https://static.usrfiles.com/ugd/12dc78_45d20a8a10e041b0803bc7768aff1e52.pdf
    • https://static.usrfiles.com/ugd/fac845_ef56b578e6974beaadd9d5b765de67fd.pdf
    • https://static.usrfiles.com/ugd/b8c837_63fa5c06e79e4155b579388d06b9f5f7.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fe7.bin
67bc13ad2b5cde2a0eadd0861fea9c65ddf8ca99d39afa9a8d3bbefdfb71e0c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE7 4896 bytes
font_01_sfnt_off00007060.bin
e8e37b67208d1feafc9a8f8d1b37e30cc3bbba537b75c47126358ee8dcc8c317		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7060 9928 bytes
font_02_sfnt_off0000925a.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x925A 4324 bytes

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