Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d20ce51879ba74b…

MALICIOUS

PDF

41.9 KB Created: 2020-09-17 21:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3d9e2be2ebcb3eb7621b13b2e4b2f0d SHA-1: e101217c6eebf5e42b192a3efbe88e8fbc00dcac SHA-256: 3d20ce51879ba74b0df8a9269a39cd36bfded9af21505159ddf3a919b2a862d1
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically `https://ttraff.club/wix?keyword=las+aventuras+de+juan+planchard+2+pdf`. This indicates the document is designed to lure users to a potentially harmful site. The presence of numerous other PDF links, many pointing to file hosting services, suggests a link farm or SEO poisoning tactic to increase visibility of the malicious redirector. The ML classifier also strongly flagged 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.club/wix?keyword=las+aventuras+de+juan+planchard+2+pdf
    • http://files.spaceatcentennial.org/uploads/1/3/1/6/131606429/5874008.pdf
    • http://files.eazyclad.com/uploads/1/3/2/6/132695278/49e3c358.pdf
    • https://bf30374e-1a83-43e7-a7fd-a10210d38420.filesusr.com/ugd/12dc78_087a433dfb7140f88eda955d808f8ae6.pdf?index=true
    • https://af1987b6-5ba8-476a-9444-82c146f18340.filesusr.com/ugd/a640e9_c33f6ac5c8684fb58e67aa907eec1c9a.pdf?index=true
    • https://bf0c4b24-a38e-4979-97fa-f488943c404b.filesusr.com/ugd/8e6e76_def3fabad559432cb98051481e4df016.pdf?index=true
    • https://54ff0802-2704-42c7-9ffa-0b8c71be9296.filesusr.com/ugd/d99ef3_4f7db881b5e149b4a8da1f0329b00384.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0430/5335/1066/files/15202076475.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/73816254174.pdf
    • https://cdn.shopify.com/s/files/1/0431/2681/6932/files/hornady_reloading_manual_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0462/5986/3706/files/37257383828.pdf
    • https://c75b5ba0-1e20-4c35-b399-65412939be5d.filesusr.com/ugd/9edd50_9792d7e117704bb19afaeb9e05bee931.pdf?index=true
    • https://4f005916-a0d0-4bbf-ac5b-008e64cabfda.filesusr.com/ugd/d17951_1ee147d07cc748bf8df6015d11142bc6.pdf?index=true
    • 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_off000061fd.bin
e005223288a6133357f4acb7b8cae72549ff29ab023caa743d946839d7d7231e
pdf-font-stream PDF embedded font (sfnt) at offset 0x61FD 5452 bytes
font_01_sfnt_off00007493.bin
1cc04c8fdeacac245b1b05f046a460cac298c80897223a58a1fc0df305b773ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x7493 11292 bytes