Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6aa9e0ecafa2f25…

MALICIOUS

PDF

35.0 KB Created: 2020-08-31 08:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24f95b8d887be0bba5f74fa5cf9dc40d SHA-1: 32cd51eb9bf1c37cf27f2d0ef9597a7419ed5f24 SHA-256: a6aa9e0ecafa2f2584e31360156b1861257c348bfe03293c5f86cad418f6cc65
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/wix?keyword=corazon+indomable+capitulo+119+parte', which is flagged as a malicious redirector. The presence of a link farm suggests an attempt to distribute malicious content or engage in SEO poisoning.

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=corazon+indomable+capitulo+119+parte
    • https://static.usrfiles.com/ugd/de65f7_1f8d3430d7c045f2a9cb90a7a4aba782.pdf
    • https://static.usrfiles.com/ugd/451461_6a28342ded1f4bac89667e19a0fa175f.pdf
    • https://static.usrfiles.com/ugd/52b593_621c79e6fb2c47afb724b060d3e70944.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6568/files/5288361827.pdf
    • https://cdn.shopify.com/s/files/1/0432/5346/5243/files/25232196114.pdf
    • https://cdn.shopify.com/s/files/1/0430/0154/4863/files/43773714455.pdf
    • https://cdn.shopify.com/s/files/1/0432/7204/4697/files/sizamagilulezamufux.pdf
    • https://cdn.shopify.com/s/files/1/0440/1404/3294/files/bless_the_lord_o_my_soul_sheet_music.pdf
    • https://static.usrfiles.com/ugd/b8c837_0cf667b027d048ed83fedcfa84e3f7d2.pdf
    • https://static.usrfiles.com/ugd/36f25b_c965d95abc294f168d2f09201da87c5e.pdf
    • https://static.usrfiles.com/ugd/10e3af_1eb8fe43954d41a6ab49f6cd535f0193.pdf
    • https://static.usrfiles.com/ugd/d54300_cbf8412dced043408894b4cc896c2a61.pdf
    • https://static.usrfiles.com/ugd/314c35_30df69d079654fc5b9e0858e1e2587e4.pdf
    • https://static.usrfiles.com/ugd/8b2c09_31307c8690324d15b7c0c69a6b636e5f.pdf
    • https://static.usrfiles.com/ugd/3f4b99_5980c68fc78e48619bf592f07dbaa89c.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_off00004b7d.bin
3d1932464019d5e59cfa3f8ec91d07b464aa0bf46499f3385c3e300558796665
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B7D 5344 bytes
font_01_sfnt_off00005d8f.bin
a536cc0ae98673e35bffb03cd87f41d7f46bc48bcbed1e92d8a1f2e237c61fbf
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D8F 9920 bytes