Malicious PDF — malware analysis report

Static analysis result for SHA-256 3431d4495f678ba3…

MALICIOUS

PDF

139.2 KB Created: 2020-08-29 14:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4a0e0c3034a54319689778f95ee9e45 SHA-1: 24060ddbb9f02d1c3ad9514c488ef5586062a13e SHA-256: 3431d4495f678ba352113d7eee53a3317ee0977c455d8545fa73719c97596fd0
174 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as a "hack tool apk", and also exhibits characteristics of a callback phishing lure. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious infrastructure, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.me/wix?keyword=app+nana+hack+tool+apk
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5214/6587/files/twitter_finagle_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/2174/6847/files/gunisudedokunip.pdf
    • https://cdn.shopify.com/s/files/1/0433/8358/6974/files/pedubo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/39510823691.pdf
    • https://static.usrfiles.com/ugd/b8c837_10ef68244060448abd7ba5d1a41ddbec.pdf
    • https://static.usrfiles.com/ugd/b8c837_97ea172f50e14b1f8697d727a5854c6a.pdf
    • https://static.usrfiles.com/ugd/ca9b0a_cf044b891db04dffbd95b45b942dcdfd.pdf
    • https://static.usrfiles.com/ugd/b8c837_393e1c2745cd476e9e03f675baba9934.pdf
    • https://static.usrfiles.com/ugd/b8c837_c07415cb6f844e31a99903a4f6f3421f.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ba7add7f4b3400391641b0a27e34fd7.pdf
    • https://static.usrfiles.com/ugd/b8c837_e3b43b291c5e40c28f94e13b21089103.pdf
    • https://static.usrfiles.com/ugd/760101_f82dde1fcd8f49758ee5e828348e97aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f400e71323044a0907474fc5acfc8b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_a0fd6ca95ad748b29772bbf24b52a278.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019674.bin
67ea5abb2ed58dd9cc17d15eefe47bc19f327aa0c2c04206b495a2b3b192a421		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19674 6988 bytes
font_01_sfnt_off0001a83c.bin
69de2e55f0666de3a45e148ace1e537f6abcab85a47aa9b6375615e46cbebde2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A83C 4800 bytes
font_02_sfnt_off0001b877.bin
2f53cee64132734b33d925e13cc3c3866e907cccdb8f831a875feae9420b5903		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B877 8864 bytes
font_03_sfnt_off0001d60c.bin
568901cd64e7d58543cf3a2f288d0ab7d0adfb8e15ca7040f6a2cb61817f30bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D60C 16204 bytes
font_04_sfnt_off00020868.bin
171be94410ad55e8217a347067d426a9ecfcbcc14a9949e4be7c276b41d1e298		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20868 16312 bytes

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