Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18ac4510d3e7a00…

MALICIOUS

PDF

43.6 KB Created: 2020-08-06 15:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c62511618012c0086c41c479100a654d SHA-1: 305b112b95c495373ff1fb68b3f2aa4d7d559863 SHA-256: a18ac4510d3e7a00d3291a15a5f7093fdc2dee1d8fca597154e40df0362108a2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass external link farm, with many links pointing to Shopify domains, but one critical link to 'ttraff.cc' which is identified as a malicious redirector. The document body, though heavily obfuscated, contains the text 'Lease agreement addendum pdf' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

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=lease+agreement+addendum+pdf
    • http://files.thedoosra.net/uploads/1/3/0/7/130775402/fowusake.pdf
    • http://files.colemansmoll.com/uploads/1/3/1/8/131857114/0df0a1c49.pdf
    • http://files.sandwatchfoundation.org/uploads/1/3/1/1/131163635/6121181.pdf
    • http://files.andersonsallstars.com/uploads/1/3/1/6/131606405/wolixoxolifi-munodenok.pdf
    • https://cdn.shopify.com/s/files/1/0435/8271/8107/files/xonateruf.pdf
    • https://cdn.shopify.com/s/files/1/0430/5790/5818/files/pevisejarofasil.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kilezolesosobusafo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9938/1157/files/10550023572.pdf
    • https://cdn.shopify.com/s/files/1/0428/7250/4483/files/fenorodat.pdf
    • https://cdn.shopify.com/s/files/1/0437/1644/4311/files/sesisozapelolufese.pdf
    • https://cdn.shopify.com/s/files/1/0448/1040/4000/files/gate_2020_syllabus_for_civil_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/texirid.pdf
    • https://cdn.shopify.com/s/files/1/0428/9812/9062/files/77067954675.pdf
    • https://cdn.shopify.com/s/files/1/0434/8336/5528/files/90409414218.pdf
    • https://cdn.shopify.com/s/files/1/0430/0396/9689/files/miruvewogiki.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/zuzogenezu.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_off00006131.bin
0be682f79776ace43d17b33b2f26400437f6ba0433e027103a814e3b3be2a35e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6131 4992 bytes
font_01_sfnt_off00007207.bin
5646f38e664b13882b87d66d8feb84994b99c05103982b88aaa88f5e7b7b12b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7207 9688 bytes
font_02_sfnt_off00009314.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9314 4324 bytes

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