Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3449d6425b100cf…

MALICIOUS

PDF

45.1 KB Created: 2020-09-01 03:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e82a6bc75c998a61257c47168ab5e58b SHA-1: f26895e8b78a5fcfb5ff0f9e1770d371c41b56d3 SHA-256: b3449d6425b100cf7d345d835ecff1d41bcd8b3590668d6e6e42d62736ca2d31
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, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=tipos+de+accidentes+de+trabajo+pdf', is designed to redirect users to malicious content. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDFs, likely for SEO manipulation or to host further malicious content. The ML classifier strongly flags 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.cc/pify?keyword=tipos+de+accidentes+de+trabajo+pdf
    • https://cdn.shopify.com/s/files/1/0433/7886/8387/files/82160852107.pdf
    • https://cdn.shopify.com/s/files/1/0430/9165/6855/files/45186475715.pdf
    • https://cdn.shopify.com/s/files/1/0435/7606/6207/files/jifuxabadizorog.pdf
    • https://cdn.shopify.com/s/files/1/0428/8118/8003/files/40024830659.pdf
    • https://static.usrfiles.com/ugd/430cb2_db633d95705e4dd58f6ed3c5019556d2.pdf
    • https://static.usrfiles.com/ugd/b8c837_762337e21b2b4b40bb75596da384d484.pdf
    • https://static.usrfiles.com/ugd/bf07b1_b15729c054284a5cac976fecf4b8159e.pdf
    • https://static.usrfiles.com/ugd/8b97dd_df86e066c0324dc2b07f4814853101a4.pdf
    • https://static.usrfiles.com/ugd/dd4472_81cbb1411ed54f569dae4d571acbc7e4.pdf
    • https://cdn.shopify.com/s/files/1/0435/5106/4228/files/algebraic_theory_of_numbers.pdf
    • https://cdn.shopify.com/s/files/1/0437/6405/6225/files/wozamefapubogexefeme.pdf
    • https://cdn.shopify.com/s/files/1/0434/2585/7703/files/arrays_in_c_programming_language.pdf
    • https://cdn.shopify.com/s/files/1/0428/1358/7623/files/susodaxukijarep.pdf
    • https://cdn.shopify.com/s/files/1/0437/7369/0017/files/kurtlar_vadisi_pusu_mzikleri_dinle_indir.pdf
    • https://cdn.shopify.com/s/files/1/0435/1442/9608/files/79350587243.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_off00006fd0.bin
0ab5cb1aa9e770782b3907ca67ccb74c7f8a3562e00b21a4dac14fe13676eb26
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD0 5280 bytes
font_01_sfnt_off000081d1.bin
e80d204c613c9569150d69e3e1a5e3f9fea7f0934f6c88941b76419499c31220
pdf-font-stream PDF embedded font (sfnt) at offset 0x81D1 10960 bytes