Malicious PDF — malware analysis report

Static analysis result for SHA-256 4609b8da39d9bd0c…

MALICIOUS

PDF

41.5 KB Created: 2020-09-01 14:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c71ad594fef1aa2cc8b76c39dbc3b582 SHA-1: 1ebb6de3281c956cb24049c8be99aa17e2596dd2 SHA-256: 4609b8da39d9bd0c4c7517b58960d567b27a7c7270dd0f01f3be39feb7ad535c
152 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a visa application form. The link leads to `https://ttraff.cc/pify?keyword=korean+embassy+visa+application+form+2018`, which is a known malicious redirector. The document also hosts a large number of external PDF links, likely for SEO manipulation or to distribute further malicious content. No scripts were extracted from this sample.

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=korean+embassy+visa+application+form+2018
    • https://static.usrfiles.com/ugd/cdb50c_65890c388808473bbbc54ba7a07c9bb7.pdf
    • https://static.usrfiles.com/ugd/4dd980_669fb3921a87449b9e92fe1f0b5019e1.pdf
    • https://static.usrfiles.com/ugd/837d34_e969142e993b44a5bc470640999bcebe.pdf
    • https://static.usrfiles.com/ugd/451461_7533a7be4da944739b50d17862d1cc68.pdf
    • https://cdn.shopify.com/s/files/1/0429/1585/6550/files/81065706776.pdf
    • https://cdn.shopify.com/s/files/1/0431/8006/4936/files/15469848746.pdf
    • https://static.usrfiles.com/ugd/b8c837_f21874f4e02c488e9fd7f7abb3329ddd.pdf
    • https://static.usrfiles.com/ugd/77d535_bae4f1846a504f80928f64d9975b9039.pdf
    • https://static.usrfiles.com/ugd/b8c837_362636c542d14cf99d234a49f50086fc.pdf
    • https://static.usrfiles.com/ugd/b8c837_00fd6fd250e344899e16bdf1cfbd0b62.pdf
    • https://cdn.shopify.com/s/files/1/0435/9864/3363/files/18444119048.pdf
    • https://cdn.shopify.com/s/files/1/0433/9456/4252/files/51224428532.pdf
    • https://cdn.shopify.com/s/files/1/0463/3414/8763/files/reportable_employer_superannuation_contributions_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0429/7120/1699/files/48628648064.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/96597279558.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000519b.bin
048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
pdf-font-stream PDF embedded font (sfnt) at offset 0x519B 6744 bytes
font_01_sfnt_off00006280.bin
28692198c923a348dbad38f4ca66386fafc64da0c4cee9dce8e536ca4e25391f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6280 5952 bytes
font_02_sfnt_off000076c4.bin
f4fdc842b273c251977ce8a3c97e3c46a74434c2a819297c9606cf0f4577f709
pdf-font-stream PDF embedded font (sfnt) at offset 0x76C4 9896 bytes