Malicious PDF — malware analysis report

Static analysis result for SHA-256 84be4215d37c3b64…

MALICIOUS

PDF

48.2 KB Created: 2020-09-01 02:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f16749299345794b35af5e40631dceb4 SHA-1: d93d3bd07dabe2e263bb6b0b0a104aabffe64d65 SHA-256: 84be4215d37c3b64dcdb297adeaca8fffdfa4cb24f2a9ceced6f757d7e9e49fe
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to the presence of a redirector link pointing to ttraff.com, which is associated with malicious activity. Additionally, the document contains a large number of external PDF links, suggesting a link farm intended to distribute traffic. The ML classifier strongly supports the malicious verdict. No scripts were extracted, and the document body is heavily obfuscated, but the primary attack vector appears to be the malicious redirector.

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=ethical+principles+in+research+belmont+report
    • https://static.usrfiles.com/ugd/ae15ca_6f579e7a0ee340fd81d356144191d4ef.pdf
    • https://static.usrfiles.com/ugd/b8c837_033de887905148569c3e85de2ab17e19.pdf
    • https://static.usrfiles.com/ugd/b8c837_8c683f470e8d4d2c9afb00afbd6570fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c6863ba88144bb3a23b51bf74ff5727.pdf
    • https://static.usrfiles.com/ugd/dba42a_33f8677784ce460fb3176d77cc321bd4.pdf
    • https://static.usrfiles.com/ugd/87a178_d7cc55dedaa043fd809b0ae3e727d0af.pdf
    • https://static.usrfiles.com/ugd/b7ab08_ebffb786bc1f44849caa5397f77b1329.pdf
    • https://static.usrfiles.com/ugd/77eba6_cf7f042032984f43adb1316347c5ddf2.pdf
    • https://static.usrfiles.com/ugd/cf14a4_32198db0c25b4de5bcab31a1c6bb7ba4.pdf
    • https://static.usrfiles.com/ugd/f4de5e_6ae036375d67422ab9804fb6dad924c1.pdf
    • https://static.usrfiles.com/ugd/7603ae_db3b446bae47455e80bbabdd589316b5.pdf
    • https://static.usrfiles.com/ugd/90c678_9ce25c97368d451eba7ece608922bd50.pdf
    • https://static.usrfiles.com/ugd/c7a620_e12029aa06c147be82b45823a5f86cd9.pdf
    • https://static.usrfiles.com/ugd/b8c837_d8353d9a4b014656bbdf633219a8d520.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007fb3.bin
bd5c99cb6700d057379774b127ab3c8a813ea9588ea4e03e3c0fdd0b22d492a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FB3 5268 bytes
font_01_sfnt_off0000916f.bin
1259b487d7a574478a40cacbe943534a5b39a7efce19a2e3db667314f603c7a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x916F 10300 bytes