Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b840fd4cd7c349…

MALICIOUS

PDF

45.9 KB Created: 2020-08-30 03:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 288b7dcf62e3d2ada4f57e4c93942257 SHA-1: 108383ca334c5c42aa7df437d5ffa785c89e42e7 SHA-256: 99b840fd4cd7c349e1fa19e607add898c58a4af00ff475cc50b8a0026ed14b0d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.com. The document body, though partially garbled, contains text related to downloading 'fnaf 2 android completo' and includes the same malicious URL. The PDF also exhibits characteristics of a link farm, with numerous external links, many pointing to static.usrfiles.com. The ML classifier strongly flagged this PDF as malicious.

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.com/wix?keyword=descargar+fnaf+2+android+completo
    • https://static.usrfiles.com/ugd/77d535_bfbe6e39457c40d7aa3abfc7cbbd1b0c.pdf
    • https://static.usrfiles.com/ugd/b8c837_14bad3e994f84c318419a69ca9908a6b.pdf
    • https://static.usrfiles.com/ugd/61b8bf_aba48cc119b6477793752e2e5706e248.pdf
    • https://static.usrfiles.com/ugd/b8c837_c87dbd217165444982bf33fe136bafaa.pdf
    • https://static.usrfiles.com/ugd/3eed2b_baac79e00d7444fe83aa00e7cb930374.pdf
    • https://static.usrfiles.com/ugd/ce14f3_4c9ac2716b1f4560ba24aeb1d91e4253.pdf
    • https://static.usrfiles.com/ugd/43d598_762156f986ec4d4995b5390cd2b5c6ce.pdf
    • https://static.usrfiles.com/ugd/7e0eb0_6dbbfa06167b4b129b15fc6e9ba8bf22.pdf
    • https://static.usrfiles.com/ugd/0f5b72_6a51d2a5455f41a0aca4ba8888dc5997.pdf
    • https://static.usrfiles.com/ugd/cf79db_e5230e54806a484ca49cbf4f26a450d4.pdf
    • https://static.usrfiles.com/ugd/3f4b99_d46f3430730a432abd66fbddebea17ab.pdf
    • https://static.usrfiles.com/ugd/9374a7_449ab8b944664221bb5bc781e0ec14ae.pdf
    • https://static.usrfiles.com/ugd/8b2c09_85854ee8d4784360be103ea5cb06fac6.pdf
    • https://static.usrfiles.com/ugd/f0f215_ece14e90f05e4bf9a2957eeaf2d68cbd.pdf
    • https://static.usrfiles.com/ugd/cf79db_b5b687c7f37944459450cea91580dbe1.pdf
    • https://static.usrfiles.com/ugd/b8c837_dca248b2fdd34075aa563d43fe792528.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://static.usrfiles.com/ugd/b8c837_dca248b2fdd34075aa563d

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067d4.bin
751b64032195776510fdb5e2462a9c8a932b3aa512548b0b3e96c802f1cd6444		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67D4 5392 bytes
font_01_sfnt_off00007a11.bin
528ed06cee70daac790e66072875d0d4f2af812ef61af99a8a9af8251a74e1b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A11 10104 bytes
font_02_sfnt_off00009ca0.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CA0 4324 bytes

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